Historical Document · 1959
The Stunt Box Teletype Corporation 1959
42 code slots, function bars and tines, selective calling, applications. 20 pp
Historical Document · 1959
42 code slots, function bars and tines, selective calling, applications. 20 pp
X09 INMLS IJdAdT1IL Id AL3141 introduction N applications functions \ basic operation NS X \ ‘A detailed operation <> <> = = <> => <> <> => = = => = => => = <> YY, conclusion PAGE SELECTOR KEY THE BIG PLUS SELECTIVE CALLING EQUIPMENT APPLICATIONS REMOTE CONTROL BASIC FUNCTIONS ELECTRICAL PULSES STUNT BOX LOCATION FUNCTION MECHANISM (basic components) FUNCTION MECHANISM (cycle of operation) FUNCTION BARS PAWLS and LEVERS COMPLETE STUNT BOX FORKS, SLIDES, SWITCHES (latching—unlatching) SELECTIVE CALLING (terminology) SELECTIVE CALLING {in action) OUTLOOK © 1959 by TELETYPE CORPORATION The age of commercial jet air travel is here. It has brought with it the need for even faster, more efficient nation- wide communication of weather data, flight plans, and routine message traffic. From the local level to central control, Teletype supplies equipment that helps meet this need. Automatic polling of outlying stations includes the utilization of the “stunt box”’ in assimilating and disseminating weather information and other air traffic data faster than ever before. | THE BIG PLUS This brochure is the story of “‘more value” ...a “BIG PLUS” feature of Teletype Model 28 equip- ment. It is the factual story of a “futuristic,” component assembly called the STUNT BOX. One of the most outstanding characteristics of 100 word-per-minute, Teletype Model 28 equip- ment is its versatility ...achieved to a great degree by this stunt box. Contained in a lightweight aluminum housing within the typing unit, the stunt box is 9% " long, 44" wide and 2% " high. Compactly arranged, it is the key to an entirely new control concept in the field of record communications. How does the stunt box affect page printer operation? Early teletypewriters had two shift positions. One was the “Letters’’ case, which allowed the operator to use 32 combinations of the conven- tional, 5-level, Baudot, telegraphic code for printing 26 letters of the alphabet and performing 6 related functions. The other was the “Figures” case, or shift position, for printing numbers, symbols and performing functions—also utilizing the same 32 code combinations. Early equipment, however, was limited in scope of operation because among other things, when additional special non-printing functions were required, it was often necessary to sacrifice printed characters. To overcome this inadequacy, the Teletype Model 28 page printer stunt box provides a “BIG PLUS” third shift feature, which enables the 32 combinations of the “‘Letters-Figures” shift con- ditions to be again reused to perform special non- printing functions, without ever sacrificing a single printed character. Also with early equipment, only one character could be assigned to perform a single function. With the Model 28 stunt box, a single character can be used or several characters can be combined what it is, what it does,. . . into a code sequence to perform a single function. These aids to printer operation, while im- portant, are only a small part of the capabilities of this unique assembly. Serving as an automatic control device for local and remote operations, responding to keyboard or line signals, the stunt box is actually a built-in sequential selector. Literally, this means the stunt box serves as a memory storage medium, with a mechanism for translating discrete electrical pulses into mechani- cal motion. This motion, in turn, further initiates mechanical or electrical actions to perform desired operations. The remote control applications of the Model 28 stunt box alone are becoming so popular that a special self-contained, sequential selector unit has been perfected just for this purpose. Major use of this dynamic unit is concerned with “selective calling’’ and “integrated data process- ing” applications. In any situation requiring re- mote control, the Teletype Model 28 typing unit with its stunt box can perform tasks usually as- signed to costly, more complex, larger equipment. Utilizing the stunt box, operational procedures in both large and small communication networks can be simplified, equipment bulk can be reduced ... money can be saved. How the stunt box got its name In the early days of printing . telegraphy, “‘stunts’’ was the term applied to nonprinting functions. These functions were actuated by function or “‘stunt”’ bars in the function assembly of printing telegraph equip- ment. Early use of the term “stunts” has been carried forward to our present = location, to calling in an entire — introduction CY day designation of the function assembly as a “stunt box.” What can the stunt box do? New uses have been found for this flexible, ver- satile unit faster than we've been able to list them. From present indications, the variety of applica- tions for this control mechanism will continue to be limitless. Basically, the stunt box will perform the follow- ing operations: 1 Mechanically initiate internal functions within the typing unit of the page printer set. 2 Electrically control functions within the page printer set. 3 Electrically control external equipment. What does this mean? Let's consider a hypothetical situation: Suppose you were a midwesterner who liked to drink hot coffee in the morning just after arrival at your office. You could arrange to have your New York operator (who, due to time differences would begin an hour earlier than you) send a signal at a specified time daily. This signal would cause the programmed stunt box in your Teletype printer to operate a switch controlling a coffee percolator. Upon arrival at the office, you could begin your business day with hot coffee, cup in hand. We mention this seemingly whimsical example only to point out the fact that .. . utilizing the stunt box . . . anyone can do anything from turning on a coffee percolator at a remote network of stations from coast to coast. applications SELECTIVE CALLING ... inter-plant or intra-plant INTER-PLANT The most popular application of the stunt box in communications and data processing is its use as a sequential selector for message Consider a nationwide inter-plant network consisting of Teletype Model 28 equipment. Circuits for this system can be established through the stunt box in a variety of ways. One city can call all other cities simultaneously . . . individually . . . or in groups of 2, 3, 4, etc. A detailed description of how this is accomplished is found in a special section of this brochure devoted to SELECTIVE CALLING functional operations. (See pages 16 and 17.) SEATTLE INTRA-PLANT The same procedure can be applied to an intra-plant operation with page printers or automatic send-receive sets located in spe- cific departments, such as: PRODUCTION << > ls Va : RECEIVING SHIPPING ACCOUNTING The principal advantage of these systems is that message traffic can be selectively directed only to those printers actually concerned with the information being transmitted. Printers in the system that are not called in are always “‘alert’’, their stunt boxes continually “‘riding- the-line,”’ waiting for specific information to be directed to them. When the stunt box recognizes a control signal directed to its printer, a “lightning’’ chain of events begins, allowing the selected printer to start operations. EQUIPMENT APPLICATIONS ... ai! involve stunt box use To illustrate an example of selective calling in actual business practice, let us consider an integrated data processing system. An operator at the keyboard of a Teletype Model 28 page printer or automatic send-receive set, completely fills out a SALES order. As she enters information onto the form, the stunt box auto- matically and selectively directs pertinent information to those specific departments concerned with the particular information being entered. For example . . . every department would get the order number, while cost information would be received only by ACCOUNTING, BILLING and MANAGEMENT. In conjunction with IDP applications . .. when a Teletype SALES ACCOUNTING printer is equipped with a sprocket feed platen for multi-carbon forms . . . the stunt box activates the operation of such required functions as horizontal tabulator, vertical tabulator and form feed-out. Other equipment applications include automatic switching, code conversion (sequential signals to multi-wire output), digital tele- metering, control of mechanical production in the “automatic factory,” error checking and a variety of special uses. A typical example of a special use is an application where the stunt box is used to “‘trigger’’ an answer back unit that sends a message veri- fication character to the sending unit. BILLING MANAGEMENT AUTOMATIC SWITCHING POPULAR APPLICATIONS en The selective capabilities of the stunt box as well as all of its other operations can be tailored to your individual needs. You have only to define what you would like it to ac- complish . . . Teletype engineers will be pleased to show you how the stunt box can fulfill your requirements. DIGITAL TELEMETERING MECHANICAL PRODUCTION CONTROL CODE CONVERSION ANSWER BACK ERROR CHECKING applications REMOTE CONTROL. . . controls electrical equipment anywhere OPERATOR AT TAPE READER KEYBOARD CONTROLS In addition to its use in selective calling and integrated data processing, another major application of the stunt box is con- trolling auxiliary apparatus. In this category is the control of Teletype tape punches, readers and business machines of all kinds. Stunt box action can tell one machine to record on tape, another to record on a form, and others to “listen” but not record. Sequential Selector Automatic Send-Receive Set TELETYPE MODEL 28 MISCELLANEOUS TAPE PUNCH EQUIPMENT Unlimited applications of the stunt box are possible through its ability to close and open electrical contacts for equipment such as alarms, signal lamps, signal bells, and motor controls in remote locations. Illuminate an area, increase pumping pressure, start a computer .. . all these, and many more, actions can be accomplished at the same time, on the same circuit—with each machine responding only to its own instruction through stunt box control. In conjunction with remote control as related to various busi- ness machines . . . through stunt box use, sequential signal input to the printer can be converted to multi-wire output for use by auxiliary equipment. An enormous field of application is opened by combining systems when this feature is employed with available commercial data processing equipment. When considering remote control equipment it should be remem- bered that the Teletype Model 28 stunt box can start or stop any electrical operation controlled by a switch. The stunt box consi idered the “robot brain 4.4 the units shown her BASIC FUNCTIONS. ... Physically surrounded by the framework of its aluminum housing, the stunt box is provided with forty two code slots. Each of these slots will accommodate a function mechanism that is designed to perform a specific function. As stated earlier, the stunt box will perform three basic func- tion operations—internal mechanical . . . internal electrical . and external electrical. These operations can be accomplished individually or simultaneously, depending on how the stunt box function mechanism has been coded, “set up,” or programmed. Normally, six of the stunt box’s code slots are assigned to standard nontyping printer functions . . . they are: 1 Letters Shift 4 Line Feed 2 Figures Shift 5 Blank 3 Carriage Return 6 Space Suppression for Line Feed Besides the six basic essential nonprinting functions, anumber of additional functions may be introduced. With modifications to the basic function mechanisms, and with additional parts placed in the remaining open code slots, the following functions may be performed: make possible a variety of applications 6 On-line, Reverse Line Feed 7 Form Feed-out 8 Signal Bell Contact | 9 Busy Light Contact { 10 Motor Stop Contact 11 Vertical Tabulation 1 Automatic Carriage Return and Line Feed 2 Unshift on Space 3 On-line Backspace 4 Horizontal Tabulation 5 Keyboard Lock The necessary parts can be supplied to equip your Teletype units for handling any desired additional functions. To increase versatility, field conversions may be made in which completely different stunt box arrangements are interchanged. The Sequential Selector c The popularity of utilizing the stunt “4 box as a control unit even where the page printer is not required, brought about the development of the Teletype Model 28 sequential selector. This unit is similar to the page printer typing unit except that the printing and paper handling mechanisms have been removed. It is exclusively used in remote control operation. Illustrated is the . Jt A sequential selector. eye, } This unit is activated by incoming sequential signals. ELECTRICAL PULSES. Teletypewriter equipment is unique in that it permits the instantaneous delivery of printed messages regardless of the distance they must travel. This is of course possible because these messages are transmitted in the form of electrical pulses—which travel with the speed of light. Pulses received and converted to tape intelligence Pulses originate at keyboard «iG . how a message is sent ChAT Eanes ee ae of current in the signal line is either permitted to continue —or is interrupted—by the operation of a contact. Messages originate with keyboard action or transmis- sion from a tape reader. Mechanical actions are converted into electrical pulses for transmission over telephone or telegraph lines and through radio facilities. “ a an Al rm | ] ( r 1 » 9 { 5 ( ; - Ps ” 1 4 STO ( a ( Ra 4 | | ( a e eee eeecse e e e e eee , e eee e e686 ee eeece e o ee ee * e é °. e e e ee eee Ss: .:«.:*6@ ee e ee eee @ eee ee e @eeee eee @ ee e ° eee 234 " over-all. . STUNT BOX LOCATION . We already know that the seemingly magic-like stunt box is a compact control mechanism measuring 934 " by 444" by Now let us relate the stunt box to the position it occu- basic operation . relationship to typing unit code bars pies when performing all of its “‘magicianly”’ tasks. The stunt box extends across the full width of the Teletype Model 28 typing unit of the page printer, Rear view of Teletype Model 28 typing unit with area occupied by stunt box shown in red. Actual Operation With an understanding of the relationship of the stunt box to the code bars we can proceed with the mechanics of actual operation. All operation begins with the receipt of a signal ...iLe., series of pulses—‘‘marking,” or—“‘spac- ing.”’ This signal is received by the selector mecha- nism of the typing unit. It is converted into mechanical action within the typing unit. Link- ages activated by this action, position five equally notched bars, called code bars, to the left if the pulse is marking or right if the pulse is spacing. Rear view of typing unit with stunt box re- moved. Code bar assembly is shown in green. Actually there are nine code bars, five for intel- ligence others for functions. From top to bottom they are identified in the illustration at right. The rear portions of the code bars are identically notched. Because some code bars will be posi- tioned to the left and others to the right, the vertical alignment of both projections and slots will present a staggered pattern. This over-all pat- tern changes with the receipt of each variation in signals received. Let us now determine how this action affects actual stunt box operation. automatic send-receive set and sequential selector. Partial section of typing unit in perspective shows stunt box in red and code bars in green. The two fork-like projections on top of the stunt box are called ‘‘shift forks."’ Shift forks position Suppression, Zero, and Figures—Letters Shift code bars through studs. oa ~-—— SUPPRESSION ——— 4 =z — i (— “7 ee 5 UNIT CODE me +47 —=—— 2 eZ —-—__——- 3 <11) a COMMON Coe —-— FIGURES-LETTERS SHIFT <> basic operation FUNCTION As previously stated, the stunt box has forty-two code slots. They are marked at 10-20-30 and 40 slot intervals as viewed from the rear. Consider one opening or code slot in the stunt box . . . let’s see how its function mechanism is affected by the code bars. This is a Function Bar SIDE VIEW The projections at the front of the function bar are called tines. The illustration below shows a partial top view of the code bars and two func- tion bars. TOP VIEW CODE BARS TINES TOP VIEW Selected function bar (Completely forward) TOP VIEW Unselected function bar (Forward motion blocked) The motion of the function bar is initially forward and then to the rear. If code bar projections do not block function bar tines, the function bar moves completely forward. If code bar projections block function bar tines, forward movement is stopped. A function bar front end as viewed from the rear of the code bars will show tines angled to the left and to the right. Tines angled to the left ¥ MECHANISM» ... basic are called marking tines, those to the right are called spacing tines. A fully loaded or “‘universal”’ function bar con- tains sixteen tines (eight “‘marking’’ and eight “spacing’’). Tines can easily be removed from the universal function bar so that it will operate on any desired code. This is a Function Pawl The function pawl is engaged by the rear upper projection of the function bar. FRONT REAR This is a Function Lever The function lever is engaged by the function pawl. TOP BOTTOM Viewed from the side, in a cut-away drawing of the stunt box code slot . . . the function bar, pawl and lever are related to each other as follows: This view illustrates a typical function box mechanism in a disengaged position. r— FUNCTION PAWL Mp} = SPRINGS i FUNCTION BAR _ FUNCTION LEVER components Stripper Blade To this view we shall add the STRIPPER BLADE which extends along the rear length of the stunt box. The motion of the stripper blade is first down and then up. Function Reset Bail To this view we shall also add the FUNC- TION RESET BAIL which moves forward and to the rear, mak- ing contact with the lowest forward projec- tion of the function bar. Movements of the stripper blade and the function reset bail are controlled by linkages to the main shaft of the typing unit. Their complete cycle of operation is based on one revolution of the main shaft. This view illustrates a typical stunt box mechanism in an engaged position. —— STRIPPER BLADE FUNCTION RESET BAIL We know that the code bars are positioned depending on the signal received. Now let us follow the simple operation of the stunt box mechanism from a disengaged position to an engaged condition and back again to a position of rest. DRA LAR FUNCTION MECHANISM ... basic operation 1 The function reset bail holds the function bar bar are not blocked by the code bar projec- FUNCTION LEVER THAT INITIATES THE in the disengaged position. tions, then the function bar will move far OPERATION OF A FUNCTION. enough forward to let the function paw! fall 2 As the typing unit main shaft revolves, pres- into engagement. The function pawl in its most rearward posi- sure from the function reset bail is released tion, still in the engaged condition, is returned from the lower projection of the function bar. 5 As the function bar is returned to the rear by to the disengaged position by the upward the backward movement of the reset bail, the movement of the stripper blade. 3 The “‘spring-loaded"’ function bar begins to function paw! also is carried to the rear. When the function pawl is raised move to the front. h 6 The function pawl engages the function lever pulls forward. The function pawl's lower pro- its spring 4 If the code combination in the typing unit which pivots with its top portion moving to jection then rests on the upper rear projection code bars is such that the tines of the function the rear. IT IS THIS MOTION OF THE of the function bar. CYCLE OF OPERATION illustrated Reviewed in graphic form the operation cycle is illustrated below: paaboanee H ehendenl > teh irate B If function bar tines Cc tind ¢ function bar me torward D Stripper blade removes E Function mechanism pawl trom tunction bar returned to disengaged positior . engages fun function lever initiates operation of s the complete ing ft function. wsm Tle res gO into detail regarding each part of the mechanism with information as to how numerous stunt box functions are performed. Coding Function Bars As indicated in this diagram . . . by snap- ping off tines, ‘‘universal’’ function bars ‘ean be coded for any one of the code Pel as fo Vw le components detailed Ce V7 FUNCTION PAWLS and LEVERS ... what they are, what they do Function Pawlis Standard Pawl pres rea — The special pawl operates its own function lever 2 See ¢ —w and the lever in the adjacent higher numbered a as . ; Special Pawl stunt box code slot. ~ veep? os "1 When this special pawl is used, an accessory There are three paw pawl must be used in the higher numbered slot. available. L Accessory Paw! components detailed V4 THE COMPLETE STUNT BOX... additional components detailed Spring Plate — Sa: ta As illustrated, the ly — . spring plate provides {eae Uy ea an anchor for one end ! me Sa: of the function lever \ spring. Function Latches If it is desirable to keep a function lever in the operated position . . . a function latch is substi- tuted for the spring plate. & fF In addition to providing an anchor for one end of the function lever spring—the function latch will engage a function lever with a latch exten- sion, and hold the lever in the operated position until released by the stripper blade during the next cycle of operation. The function lever can be kept in the latched position for any required length of time. Three additional methods of unlatching are available. The first method is to have a single stud on an adjacent lever release the latch when required. A lever with a double stud will operate latches in adjacent slots on both sides. A latch release bail shaft is also available for unlatching. Function lever latch release bail shafts span code slots at varying intervals from 4 to 35 slots. Shaft lengths extending across the following con- secutive code slots are available: 4, 6, 8, 9, 12, 14, 17, 22, 25, 27, 32 and 35. detailed operation €> FORKS, SLIDES, SWITCHES ... also... latching... unlatching Shift Fork Switches The shift fork engages the vertical posts Switch blocks for mounting on function lever guide that move the zero, Figures-Letters plate are available. Each block can be equipped shift and suppression code bars from with up to four arms for “make”, “break” or the marking to the spacing position. transfer contact operation. With stunt box pro- gramming these arms can be set for momentary operation of the contacts, for one cycle of opera- Shift Slide tion, or for a sustained condition of closed or Shift slides operate the shift fork. Shift open contacts. slides are operated by function levers. A. Shows “make” or contact switch arm with rear- From one to six function levers can ward action of top of function lever. operate a single slide. Illustrated at B. Shows “‘break"’ or no contact switch arm with left are typical shift slides. rearward action of top of function lever. LATCHING—UNLATCHING ... key fo sequential selection ay won + encoun Let us now follow the sequential operation receipt of the second character of the select- FUNCTION MECHANISM FUNCTION of the function mechanisms in a stunt box ing sequence, initiating a similar chain of — MECHANISM that has been coded to perform a function events. THIRD on the receipt of the third character in a While the second function bar is being FUNCTION sequence of three characters. selected, the stripper blade descends and ape ty ~ —oe The first character of the three character strikes the first latch lever arm which sequence is received by the selector, proc- releases the first function lever. Should a essed by the typing unit linkages and code character be interposed between the first bars, and then interpreted by the first and second character of the selecting se- function bar. quence, the projection blocking forward The function pawl of the selected (first) movement of the second function bar will be function bar pivots the first function lever, restored, and will prevent selection of this around its pivot point. This movement re- function bar by the second character of the LATCHES a moves the blocking projection of the first selecting sequence. BLOCKING FUNCTION function lever that has been preventing the While the second function lever is latched PROJECTION =: LEVER forward motion of the second (or adjacent) in the operated position, the third consecu- Cutaway of Stunt Box function bar. tive character of the selecting sequence will Three Function Mechanisms Detailed COLOR CODE The first function lever is latched up in its position the code bars to allow operation of operated position by a latch lever. The the third function bar, which through its (Note: Not in true scale. ee Coe stripper blade rises to disengage the first function lever activates a switch, slide, phe seasieie } machen ON @ @ @ SECOND FUNCTION MECHANISM function pawl from the first function bar. lever, bail, etc., to perform the desired THIRD FUNCTION MECHANISM The second function bar is selected by function. ¢> detailed operation SELECTIVE CALLING... ferminology Teletype Model 28 Keyboard consists of Typical four rows of keys; top row of “'red"’ func- Loe FUNCTION tion keys . . . and three rows of ‘‘green"’ LF Key T printing character keys. oy Sop Top portion of key top indicates character printed in “FIGURES.” Typical CHARACTER Key Tops Bottom portion of key top indicates character printed in “LETTERS.” Illustrated at right is a Teletype Model 28 Automatic Sena-Receive Set. Keyboard is identical to Teletype Model 28 Page Printer. introduction to selective calling Before illustrating and describing a typical selec- tions as indicated on the lower portion of the riding the line, waiting for information to be tive calling operation in detail, we should first be printer's green keytops. directed to it. . + . * 2 h . or: "” P : ? acquainted with some general information about When the typebox shifts to ‘‘Figures"' the The detailed d iption of selective calling at the page printer and what it will do. second area, symbols and numerical char- acters as indicated on the upper portion of right, applies to a method that one specific cus- ‘Specifically the beige Model rd pal printer the keytops will be printed. tomer has elected to use. will perform in Gye Suste eperetionst arene. 3 In the third area, ‘‘Select-Non Print," direct This system provides for the assignment of an 1 The first of these areas is referred to as printing is suppressed while the signal + identification code to every printer on the circuit. “‘Letters."' In this condition the printer types selector and stunt box remain active. The This code can be made up of any character or alphabetical characters and performs func- printer is always awake, its stunt box always sequence of characters. detailed operation €> SELECTIVE CALLING ... sequential selection in action CONDITIONING CODE CALL DIRECTING CODE END OF ADDRESS END OF MESSAGE SELECT—NON PRINT We already know that various function levers, pawls and bars along with other parts of the func- tion mechanism can perform functions, block func- tions and control time intervals of make or break electrical contacts. With this knowledge, we can in detail show how the systems illustrated on page four can operate. Identification Codes, or call directing characters (CDC’s), are assigned to each printer in the sys- tem. The following four basic steps are in this plan: 1 Conditioning Code—With the transmission of a sequence conditioning code such as ““Figs-H-Ltrs,"’ the printers will respond to the three characters in the following manner: The “Figs” function mechanism unlatches the “H" function mechanism. The “HH” mechanism will operate if selected. The "'H"’ function lever activates the latch release bail which trips off function levers with shift forks that return the zero and suppression code bars from the spacing to the marking position. This means all of the printers on SELECT—PRINT the circuit are now in what is called the SELECT-NON PRINT condition. The “‘Ltrs"’ signal is used to compensate for mechanical time lag. Call Directing Code—With the reception of the identification code or call directing character or characters (CDC's) that are assigned to specific printers in the system —selected stunt box function mechanisms move the suppression code bar to the spac- ing side, unblocking the type box clutch of the typing unit. All of the printers that have been selected are now in the SELECT PRINT condition. These printers are in the ‘‘Let- ters"’ print position and they are now ready to receive and type a message. (In calling printers, when more than one character is used as a CDC, the function lever of the first character is latched up to permit the 2nd function ver to operate. See “LATCHING . .. UNLATCHING,” page 15.) NON SELECT—NON PRINT SELECT—NON PRINT 3 End of Address—After calling in the print- ers which are to receive a message, a sequence of characters such as ‘'Carriage Return-Line Feed-Letters,'' is transmitted by the originating printer. This is known as the end of address code and causes the zero code bars of all printers to shift to the NON- SELECT position. The purpose of the ‘END OF ADDRESS" sequence of characters is to prevent un- called printers from receiving the message accidentally should their CDC be trans- mitted during normal message traffic. End of Message—After the messages have been transmitted, it is desirable to place all of the printers in the select-non print condi- tion. This is accomplished by transmitting the conditioning code, ''Figs-H-Ltrs."' Being in the SELECT-NON-PRINT condition, the printers are standing by .. . their stunt boxes alert to line transmission. €> UY conclusion OUTLOOK ... what of the future? : Teletype equipment, accepted as an important economic tool of tions, mines . . . radio, electronic and computer systems manufac- business and industry, serves the nation in many ways. turers . . . wholesalers, retailers, distributors in every field .. . , Military and civilian governmental agencies tie in their far flung telephone, telegraph and cable companies . . . these and many outposts directly to control centers for fast dissemination, evalua- more, all use Teletype equipment. tion and disposition of information. With Teletype printed com- The stunt box plays an important role for these users of Teletype munications there is no misunderstanding. products. The proven dependability and accuracy of precision made, lab and field-tested Teletype equipment, augmented by the Maer srenepeaeees users of Teletype equipment oir lines versatile stunt box, assures maximum operating flexibility and railroads, and over-the-road carriers . . . maintain schedules, han- pe dle reservations, record manifests . . . use Teletype units to com- efficiency. F —_ . , Every potential purchaser or lessee of communications, auto- municate in every way. ‘ . . . , : : : ; mation or data processing equipment should investigate thor- Automobile manufacturers ass the selective aspects of this equip- oughly . . . determine not only current, but consider future needs ment to produce “custom styling” for your automobile. before making an equipment choice. Press associations use Teletype units to get news to all member Whatever the extent and complexity of the task ahead. . . papers simultaneously. Teletype Model 28 equipment is better equipped to do the job. The list is practically endless . . . police, brokerage firms, hotels, The acknowledged world leader in printed communications . . . ae ae ae chemical manufacturers, hospitals, Red Cross, steel companies, equipment that bears the trademark ‘““Teletype’’... has more of Teletype Mode! 28 pipe lines, oil and gas refineries, universities, research organiza- “BIG PLUS” features to offer. Send-Receive Page Printer. complete TELETYPE Model 2, product line of equipment is available —W TELETYPE CORPORATION . .. to answer your specific questions Teletype GENERAL OFFICES GOVERNMENT LIAISON application engineers will be pleased to help 5555 Touhy Avenue OFFICE Sod . Skokie, Ilinois you to most efficiently apply Model 28 units to monde 425 13th Street, N.W. s: ORchard 6-1000, Skokie your communication problems. Why not eee. COmelia 76700, Chicago Washington 4, D.C. Direct Distance Dialing Phone: MEtropolitan 8-1016 contact Teletype today! hres Guin 512 *“Unattended Service”’ at this offi “TWX: SKOK 3454 porusite muuigt of emai +8) W.U. Service on Premises communications after office hours. = 7” ce ee ail TELETYPE mM LE a oe — i oe a sussipiary of Weslern Electric Company inc THE ACKNOWLEDGED LEADER IN DATA COMMUNICATIONS PRODUCT LINE PRINTED IN U.S.A. i] "1 an * 8S843M22361