US2391469A - Communication and posting system - Google Patents

Communication and posting system Download PDF

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Publication number
US2391469A
US2391469A US552428A US55242844A US2391469A US 2391469 A US2391469 A US 2391469A US 552428 A US552428 A US 552428A US 55242844 A US55242844 A US 55242844A US 2391469 A US2391469 A US 2391469A
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United States
Prior art keywords
relay
row
flight
indicators
blank
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Expired - Lifetime
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US552428A
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English (en)
Inventor
Joseph C Marshall
Harold F May
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Teleregister Corp
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Teleregister Corp
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Priority to BE467205D priority Critical patent/BE467205A/xx
Priority to GB4631/41A priority patent/GB563524A/en
Application filed by Teleregister Corp filed Critical Teleregister Corp
Priority to US552428A priority patent/US2391469A/en
Priority to GB16750/45A priority patent/GB604297A/en
Priority to CH266776D priority patent/CH266776A/fr
Application granted granted Critical
Publication of US2391469A publication Critical patent/US2391469A/en
Priority to FR938252D priority patent/FR938252A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G5/00—Traffic control systems for aircraft
    • G08G5/20—Arrangements for acquiring, generating, sharing or displaying traffic information
    • G08G5/26—Transmission of traffic-related information between aircraft and ground stations
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G5/00—Traffic control systems for aircraft
    • G08G5/20—Arrangements for acquiring, generating, sharing or displaying traffic information
    • G08G5/22—Arrangements for acquiring, generating, sharing or displaying traffic information located on the ground
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G5/00—Traffic control systems for aircraft
    • G08G5/50—Navigation or guidance aids
    • G08G5/56—Navigation or guidance aids for two or more aircraft
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1804—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for stock exchange and similar applications

Definitions

  • FIG. I FIG. 2 FIG. 3 FIG. 4
  • FIG. 5 FIG. 8 FIG. 7 FIG. I2
  • FIG. 9 FIG. 9 FIG. I0 FIG. ll
  • nals representing the information thus posted may be transmitted either from a local transmitter or from wire or radio transmitters reas to the direction of the various flights; the estimated time when the-aircraft will pass over or land at Certain marker points on the flight route; the time at which the aircraft actually passes over or lands at specific marker points; the expected approach time when the pilot may receive instructions ,to start his approach to a landing field; the proposed altitude at which the clearance has been issued to cross each marker or flight path; the altitude at which the aircraft actually crosses the various markers or flight paths, and
  • the landing sequence number assigned to landings 1 under instrument conditions In addition to the motely situated with respect to the receiving postmg and recording apparatus, and in which the remote transmitters may be located either at ground stations or within aircraft in flight.
  • information'thus posted on the bulletin or announcing board usually relates to.
  • numerous flights which may be identified by numbers, and the indicators on which the items are posted usually are arranged in display groups according h to the various marker or Fix classification and preferably are arranged within each Fix group in accordance with the expected or estimated.
  • time of passage or arrival of the aircraft at the various recording or marker points en route and at the airport The flight data posted may have to be changed from time to time during the progress of the flights as the result of conditions affecting the progress of aircraft, such as poor visibility, lice, changes in the direction and velocity of thewind, the necessity of blind landings, and other emergency conditions.
  • the information'posted may comprise numerous data such as the flight designation numbers,
  • flight progress display boards such as an I indication that a clearance through a marlrerf or Fix has been issued, an indication of a flight over the airport, an indication of a stop en route, and an indication that an aircraft has been cleared to the airport control tower or rangestation so that there will be no delayin landing.
  • local communication facilities comprising known telephone ortelegraph wire or radio equipment may be employedto establishjcommunication between the air line companys dispatch offices and the various aircrafhairportcontrol towers, the local communication operator in the airwaytrafilc control, government regulating bureaus, military operations oflices, if-any, and other airports.
  • air line companys dispatch offices and the various aircrafhairportcontrol towers
  • the local communication operator in the airwaytrafilc control
  • government regulating bureaus government regulating bureaus
  • military operations oflices if-any, and other airports.
  • a record board havin electrical signal storage rotatable indicators on which information in regard to the various flights is stored, in random order on the board, and a display board having a plurality of rotatable indicating devices for displayinginformation in regard to the'flights with sequenc ing apparatus controlled by the signal storage devices ofthe record board for obtaining information therefrom and automatically selecting and energizing the indicators on the display board to cause them to display in a predetermined serial order the items of information stored on the record board.
  • the order in whichthe items were to bewritten or rewritten on the display board was'determined by the settings of new position storage devices manually set by an 1-; attendant who determined the desired serial arrangement or order of the items to be displayed or rewritten on the display board, and who assigned corresponding position numbers to the items on the recordboard.
  • theznew position storage devices are automatically set by the incoming flight signals to'indicate or produce a desired serial order of 7 items when the display board is rewritten, in accordance with the relativevalues. of data con-,-
  • the new" position storage devices embody visual indicating means whereby numbers or other indicia are automatically posted.
  • the control personnel may manually reset the indicators in the display board, as by means of a key set or otherwise, although preferably the resetting of the display indicators is. automatically controlled by the new position storage devices, the only manual operation required being. that of initiating an automatic sequencing operation. If' desired; the display board could. automatically be rewritten at predetermined intervals by switch means periodically controlledby clockwork .or other. suitable mechanism, although. ordinarily the rewriting operation of the board is left. to. the discretionof'the controller or other member. of..ithe,operatingj JardinL. Also, from, theinew positionv numbers displayed by thenew position storage. indicators, the. personnel may. selectively pick out and transmit ina predetermined order certain of. the. stored items "to auxiliary posting boards or. other apparatus'.
  • blank row locator apparatus which functions when the flight locator fails to find an existingpostedv flight identification corresponding to the flight. identification .in anincoming message; When. no existing posted identification" is found, the blank row locator selects an available rowof 'indicatorsfin the display board and also in the record preferablyalthough'not necessarily, is the lowest blankrowin the display board and is'the first blank rowabove existing postings in the. record board. In these selected blank rows, the new item of information including the flight identification indicia; which. usually is a number; is posted without: the needfor manual control.
  • the blank row: locator apparatus functions when the night locator fails tofindan item-with an identification number identical to that'contained in the incoming message.
  • The-'time comiparator apparatus functions whenever an incoming report or message contains time. If neither of the foregoing conditions occurs when a flight message-isreceived, neither the blankrow locator nor the time.
  • comparator. circuit. is: required to function, and the received information is posted on the groups of indicators in the record and display boards where information in regard to the flight iscurrently posted.
  • Oneof the objectsof the invention is a system for automatically receiving, storing and posting which precedes each board, which data, in .regard. to, various items, particularly aircraftand other vehicles, which system has means responsive to. incoming signals for automatically comparing certain data in incoming messages with the same kind of data in th prior messages posted and for storing signals and/ or posting indicia representative of a predetermined serial orderin whichsaid items should be posted.
  • Another object is a posting or announcing system which utilizes two boards; having indicators I carrying substantially the same information, or on which certain information is duplicated, one of which boards is a record board on which the information "regarding various flights or other-items maybe storedv in more or less random order-andthe other a display board on which the various flights or other'ite-ms may be displayed'in a particular seria1-order orsequence which is automaticallydetermined from the relative values of certain data in the messages thus posted.
  • Still another object- is theprovision of means for rewriting the -information on the display board in'a predeterminedserial order-or sequence which automatically is determined in accordance with the. relative values of certain data in the messages posted, and in which a multiplicity of rows of indicating -devices in the display board may simultaneously or concurrently be rewritten by multiple row sequencing operations.
  • An additional object is an arrangement whereby the. order in which the flights or other items are displayed on' the" display board may be changed to" display the items in chronological order as. determined; automatically by certain time datairr said items.
  • Another. object is a system in which the relative positions of the flights. or other items displayed. on the display board are determined by the settings of new position storage units which are automaticallyv setand/or reset in accordance with the relative :values of certain data contained in the incoming messages with respect to similar data. currently, posted in. regard to the-flights or other items.
  • Another object is a system and apparatus for automatically effecting a comparison between 4 a certain datum contained in an incoming message and' the same. kind of data posted on the board with regard to other items and for indicating or relocating the relative posting position or positions of. the incoming item or of the currently posted'items, or both, in accordance with the new datum.
  • a further object is apparatus for determining from the item designation in an incoming message whether information in regard to the item is currently posted, and if not, for finding an available blank row-of posting devices for entering theinfonnation in regard to the new item.
  • Fig. 1 is a view, partly in diagrammatic form, of incoming telegraph line equipment, together with a receiving distributor for applying the incoming signals to certain storage relays, and another distributor associated with the time comparator circuit;
  • Fig. 2 shows a pulsing distributor and associated pulsing and control relays
  • Fig. 3 shows certain Fix, flight identification and data storage and'decoding relays
  • Fig. 4 shows a time comparator circuit with "new time relays, and a base time switch and associated relay equipment
  • Fig. 5 illustrates certain-blank row selection relays and record board gang relays
  • Fig. 6 shows new position storage indicators
  • Fig. 7 shows time and altitude storage indicators and present position storagerelays
  • Fig. 8 shows certainblank row selection relays and base position rotary switches
  • Fig.9 is a view of Various time comparator relays
  • Fig. 10 shows blank row locator rotary switch equipment
  • Fig. 11 represents diagrammatically a plurality of rows of indicators in the display board and gang relays associated therewith, and shows in diagrammatic form sequencing equipment for rewriting the display board;
  • Fig. 12 shows certain other sequencing equipment for rewriting the display board
  • Fig. 13 is a diagram showing various units of the system and their relation with respect to each other; and 1 Fig. 14 is a diagram showing the arrangement of the various sheets of drawings illustrative of the system.
  • Rotatable indicators IT, IU, TT, TU, AT and-AU which are arranged in horizontal rows designated 00 to M, in Figs. 6, 7 and 11, preferably are employed as the recordingand display devices. Each row'of indicators, when identified with a certain flight,
  • the flight identification is adapted to display the flight identification.
  • the flight information or data for example, the estimated and actual times at which the aircraft reaches or passes a particular location or Fix, or the proposed and actualaltitudes of the aircraft at the various points, and also any additional information that'may be desired.
  • the flights may be recorded or stored in the record board in random order, it is-highly desirable that in the flight progress display board of Fig. 11 the flights and information iii-regard thereto be displayed in a predetermined order corresponding to the relative values of either the altitude or time data, the indicators also bein arranged in groups corresponding to the diflerent Fixpoints to which they relate, such as Fix I, Fix 2, Fix 3, etc. Both the record board and the flight progress display board may be located at the.
  • Types of indicators employed-In the decimal system of counting, ,theudigit: Orprecedes the digit 1 and'represents. the absence. of a quantityinthat denominational position in which it appears.
  • Rotatable step-by-step indicators of the type hayingeleven settable positions comprising ten digitdisplay'positions and a blank position preferably, although not necessarily; are employed; insll'ch indicators the digit 1 ordinarily follows :the blank position on the indicator drum in order that the number of stepping pulses necessary to actuate the. indicator to any digit position will be equal to the Value of the digit displayed. Therefore, if it is, desired to use a uniform typeof step-by-step indicator throughout the.
  • the digit should. follow the blank position on. the indicator drum.
  • the number ofstepping pulses necessary to advance-theindicator drum from its bank position to any digit will be. one greater than the value of the digit, and thepulse generating and transmitting equipment employed in this, case is designed to-generate one pulse more than, the. number representedby the digit posted.
  • step-by-step indicators one type may have the digit 1 following. the blank position, whereas the other type used for the new position indicatorsv may have the digit 0 following the blank position.
  • the item also contains such information as a flight identification number, the altitude of the plane and often other data pertinent to the control of air tramc.
  • the item (on the record board only) also bears a. position number, of one or two digits, which corresponds to its proper relative location on the display board. Physical location is random on the record board, the position number taking the place of the actualphysical ordering on the display board.
  • Time maybe displayed either as two digits, representing minutes, oras four digits, representing hours and minutes. For simplicity the system illustrated herein displays the time in minutes.
  • the position numbers of the rows are posted When the first item is posted, the row bearing the lowest position number is: chosen. When the next item is received, it is posted in the row bearingv the next. lowest position number. This selection of rows is accomplished by the blank row locator. If, however, time is included in the information, an additional comparison takes place to change the position numbers if necessary. In any time comparisons, blank time is considered greater than any specific time to insure that all items including time data will be segregated at the bottom of their respective Fixes.
  • the flight locator finds the existing item instead of the blank row locator assigning'a rows Otherwise the same comparison as described above occurs.
  • the selected rows have their positionnumbers advanced one-step, and .the'original position number of the lowest selected row is rewritten in the'row where the new information isto be; posted Under certain conditions new information will require changing an item to-show alater time than that previously posted... This will. generally requirexthe position number'of. that item to be increased. In this case the-rows betweentheold and new position numbers will. requirea reduction in position number.
  • These rows are selected by the combined requirements of-havingpostedtimes lower than the new time received and-position numbers greater than the present position number of the item being changed. The. following diagram shows how these. requirements determine and select the. rows to. be changed.
  • Base position scheme-It is not feasible to drive the step-by-step indicators backward, and therefore a different method-of lowering the position numbers of the selected rows is employed.
  • thismethod the position'numbers of all rows except the selected rows are raised; this lowers the position numbers of the selected rows relatively.
  • any number may be assigned to the lowest numbered row-in the board.
  • a base position number which is a means of keepinga record of thelowest numbered item on the record board;
  • The-positionnumbers recorded for the individual items are not the actual row numbers which the item should occupy but are merely a relative indication which is referred to a changeable base position to determine the true display board row. Consequently, when it is necessary to lower the position numbers of selected items, the position numbers of all other items are raised and also the base position number is raised. It should be noted that a base posi tion recorder is required because of the repeating nature of the position numbers.
  • Base time scheme When making comparisons of time, a problem similar to that of the position comparator is encountered. Time, being cyclical, repeats itself every twenty-four hours when hours and minutes are employed, and in the present disclosure time repeats every sixty .minutes, since only two indicators are used. The question arises as to which time is greater when, for example, one time is 2:50 and the other 3:10. In order to ensure correct comparisons, it is necessary to provide base time indicating equipment to'record the lowest time. In the example above the base time indicated might be :40. Referred to this standard it is evident that :50 is lower than :10. The base time equipment indicates the'zero point in the time cycle, just as the base position indicating equi ment indicates the zero point in the position cycle. 1
  • the incoming signals for posting on the record board and the display board may beof any suitable type.
  • permutation code signals for example, five-unit code signals
  • the line equipment IOI contains receiving distributors for applying incoming signals to tapereperforators of knownrtypes, for example, as disclosed in Hoover Patent 2,252,852 and 'Dirkes et a1.
  • the perforated'tape is fed through conventional tape transmitters whereby the stored signals are repeated and applied to a distributor such'as DRI shown in Fig. l;
  • each flight information message comprises numerical, alphabetical and functional characters.
  • the first two characters or digits of the message represent the flight identification numbenand the third character a digit which represents a particular Fix;
  • the fourth character is a range or selecting signal, which usually is an alphabetical character, for the data posting indicators, for example, Time, in which case .
  • the fifth and sixth characters are the tens and unitsdigits respectively of the Time, and are followed by two spacing signals which are interposed between the first and second parts of the message when both Time and Altitude-information dataare transmitted.
  • the first two characters following the secondspace signal again represent the flight identification number, the third character the Fix number; the four character is therange or selecting signal for the'Altitude posting indicators, and the following two characters are the thousands and hundreds digits of the Altitude, and a'refollowed by theend-of-mess'age signal, which isusually transmitted by the key L of the printer'keyboard.
  • each complete message r'eceived by the receiving distributors in the line equipment isfollowe'd by an endof-message signal which is stored in a group of relays and which causes'seeker mechanism in' the line equipment to function and start an associated tape transmitter into operation to transmit' the received message during a revolution of the distributor DRI of Fig.
  • Thestart magnet SMI operates in series with the transmitter-connecting relay in the line equipment, by meansof conductor 1 in. cable I02,
  • the'first digit of the identification number of the' aircraft or other source from I which a report or message is being received is the digit 1.
  • the five-unit permutation code pulses for digit 1 are marking, marking, marking, spacing, marking, and'when the row of tape perforations representing'digit 1 passes through the tape transmitter of the line equipment, conductors I, 2, 3 and nowadays of cable I02 will beenergized with battery from the marking bus of the tapetransmitter. Since battery is supplied only to conductors I, 2,3 and 5 of cable I02, only relays ITI, 'IT2, 1T3 and 1T5 will be operated.
  • relays operate and lockover a circuit from ground at their windings, through their make contacts andarmatures 325 to holdingbattery 220 furnished over conductor 20I through normally closed contact and armature 202 of relay RAGA, Fig. 2, and normally closed contact and armature 2I9 ofrelease relay REL.
  • the remaining characters are transmitted by segments 6, 8, I0 and I2 of rings I, 3, 5, l and 9 of DRI, and successively are stored in the Fix relay group, Fig. 3, the range relay group, Fig. 1, the first digit data group, Fig. 3, and the second digit data relay group, Fig-4.
  • Blank row Zocator In order to provide the blank row locating feature, the distributor DRI has been modified to include circuits which originate from segments I and II of ring II, the purpose of which will be explained below under Blank row selection.
  • the flight identification number stored on the identification relays was used to locate the flight on the display board. In general, this operation involves energizing one conductor in each of the storage indicator multiples of the Identification and Fix indicators in the display board. These multiples in the instant disclosure are identified by reference numerals 303, 304 and 309 and are shown in Figs. 3 and 6.
  • the] apex of the relay pyramid PRI associated with the first digit identification relays ITI to 1T5 is supplied with ground at armature 305 of relay ITI, over conductor 306 and normally closed contact and grounded armature 201 of blank row selector relay BRS, Fig. 2.
  • the multiple cable 303 is connected to corresponding banks 60I of thefirst digit'identification storage indicator 692, Fig. 6, in each of the horizontal rows of storage indicators of the record board. Fifteen of such rows of indicators are shown in the drawings, the lower fourteen rows 98-43 being indicated diagrammatically in Fig. 7, and the upper row No. I4 being shown in detail in this figure. It will be understood that in practice-a great many more rows than those indicated will be employed in the record board; in an average size installation there may be 2500 or more rows of such indicators.
  • Each horizontal row of the record board contains storage or recording units NPT, NPU, F, IT, IU, 'IT, TU, AT and AU, the upper row I4 of which is shown in Figs. 6 and 7, these recording units respectively storing digits representative of the new position tens, new position units, Fix, identification tens, identification units, time tens, time units, altitude tens and altitude units.
  • the recording units preferably are step-by-step indicators of the type disclosed in Haselton et a1. Patent 2,155,825,.issued April 25, 1939.
  • Such indicators are provided with a set of equally spaced contacts corresponding in number to the number of positions to which the indicator drums may be rotated by electromagnetic pawl and ratchet structure, the contacts being arranged in a continuous series.
  • the wiper arm is attached to the indicator drum assembly and engages the contacts of the indicator in accordance with the instant setting of the drum; for example, if the drum is set to display the digit 1, the wiper will be engaged by the contact I; similarly, if the indicator is set for its blank position, the associated wiper will be in engagement with its blank contact B.
  • the contact assemblies herein referred to are illustrated schematically in arcuate form in the drawings to show more clearly the circuits connected thereto, it being understood that the wipers take settings in accordance with the flight identification and information digits or symbols posted bythe'indicators.
  • the restoration circuit to ground is opened and an actuation or resetting circuit is closed by a switch element, such as indicated at s intheindicators of Figs. 6 and 7, thereby to cause the indicator to stop when it reaches its'home position and its actuating coil switched to an actuation circuit, as disclosed in the patents to Haselton 2,049,499, issued August 4, 1936, and Hicks et al. 2,189,581, issued February 6, 1940.
  • the subsequent application of the resetting or actuation pulses to the indicator causes the switch member s to be restored to its former position when the indicator leaves its blank position during the resetting operation.
  • Cable 304 is multipled to banks 603 of the second-digit identification storage --indicato-r 804 in every row of the record board.
  • the Fix storage relay's'FI to F5, Fig. 3, function in amanner simi-v lar to the identification storage relays, but the cable multiple 309 from the Fix pyramid is connected to the banks of a manually settable tap switch 606, Fig. 6, in each row of the record board.
  • the Fix character while not actually a part of the flight identification number, represents the section of the record board which is assigned to all flights passing over a certain geographical zone, and, the same flight identification of the recground on armature 3 I of the Fix relay FI, Fig, 3, through its normally closed contact to armature 3 of relay F2 which is now operated in accordance with the character 8 which in permutation code has the signal elements 2 and 3 marking in character and which is stored on the Fix storage relays.
  • This ground is extended through the make contact associated with armature 3 H relay F2, armature 3I2 and make contact of energized relay F3, and normally closed contacts of. relays F4 and F5 to conductor 8 in cable 309. Since the brush of the Fix switch 606 in row I4, Fig.
  • a path to a relay F0 is established from battery 608, and FC operates.
  • This relay connects batter from 608 through its armature 640 and make contact tothe winding of a units comparator relay UC, the circuit continuing through armature 609 and mature 646 and make contact, conductor II in break contact of a transferrelay TR, to the brush of bank 603 of the IU indicator, and then through bank terminal 8 and conductor 8 in cable 304 to the second digit identification pyramid PRI in.
  • Relay UC operates and connects battery -6II through armature GM and break contact of the transfer relay TR, armature 642 and make contact of operated relay UC, armature 632 and break contact of the relay TR, to the winding of the relay TC.
  • the circuit from this winding con- 'tinues through armature 643 and break contact of relay TR, to the brush of contact bank of the IT storage indicator in row I4; Since this brush is resting on'bank terminal 0, the circuit is extended over lead 0 in cable 303 to the first digit identification pyramid, Fig. 3.
  • Relay TC Fig. 6, operate and connects battery 6
  • I 1 Relay AGAI 4 operatesand locksup overitsarcable 309, through armature 224 and breakcontact of relay RAGA, Fig. 2, and armature 22.6 and break contact of release relay REL, to battery 220.
  • the operation of relay AGAI 4 applies battery, throughits armature 648 and make contact, to conductor 29 in cable 506, and thenc to the winding of gang relay GAI4, Fig. 5.
  • the circuit continues from the winding of this relay, over conductor'8 in cable 502, and through the winding of relay GOT,Fig. 1, to ground.
  • the op-' erationof relay GAI4 required the successive operation of relays FC, UC and TC, indicating an agreement in the Fix, second digit identification and first digit identification characters.
  • relay GOT operates in series with it.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)
  • Time Recorders, Dirve Recorders, Access Control (AREA)
US552428A 1944-09-02 1944-09-02 Communication and posting system Expired - Lifetime US2391469A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE467205D BE467205A (en(2012)) 1944-09-02
GB4631/41A GB563524A (en) 1944-09-02 1941-04-07 Improvements in or relating to communication systems
US552428A US2391469A (en) 1944-09-02 1944-09-02 Communication and posting system
GB16750/45A GB604297A (en) 1944-09-02 1945-07-02 Improvements in or relating to communication and posting systems
CH266776D CH266776A (fr) 1944-09-02 1945-08-22 Installation pour l'enregistrement et l'exposition d'informations concernant différents items, notamment d'informations concernant les mouvements d'avions.
FR938252D FR938252A (fr) 1944-09-02 1946-07-10 Perfectionnements aux systèmes de communication et de signalisation

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US552428A US2391469A (en) 1944-09-02 1944-09-02 Communication and posting system

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US2391469A true US2391469A (en) 1945-12-25

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US552428A Expired - Lifetime US2391469A (en) 1944-09-02 1944-09-02 Communication and posting system

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BE (1) BE467205A (en(2012))
CH (1) CH266776A (en(2012))
FR (1) FR938252A (en(2012))
GB (2) GB563524A (en(2012))

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2439862A (en) * 1944-03-31 1948-04-20 Gen Railway Signal Co Airway traffic controlling system
US2443199A (en) * 1945-10-04 1948-06-15 Teleregister Corp Airway traffic control system
US2474438A (en) * 1945-02-06 1949-06-28 Teleregister Corp Communication and posting system
US2568756A (en) * 1945-09-05 1951-09-25 Int Standard Electric Corp Reservation system
US2614169A (en) * 1950-07-24 1952-10-14 Engineering Res Associates Inc Storage and relay system
US2932812A (en) * 1956-02-24 1960-04-12 Gilfillan Bros Inc Traffic analyzer
US3239812A (en) * 1961-03-08 1966-03-08 Lesser Norton Plural order selecting system responsive to a plural digit number
US4975696A (en) * 1987-03-23 1990-12-04 Asinc, Inc. Real-time flight and destination display for aircraft passengers

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2439862A (en) * 1944-03-31 1948-04-20 Gen Railway Signal Co Airway traffic controlling system
US2474438A (en) * 1945-02-06 1949-06-28 Teleregister Corp Communication and posting system
US2568756A (en) * 1945-09-05 1951-09-25 Int Standard Electric Corp Reservation system
US2443199A (en) * 1945-10-04 1948-06-15 Teleregister Corp Airway traffic control system
US2614169A (en) * 1950-07-24 1952-10-14 Engineering Res Associates Inc Storage and relay system
US2932812A (en) * 1956-02-24 1960-04-12 Gilfillan Bros Inc Traffic analyzer
US3239812A (en) * 1961-03-08 1966-03-08 Lesser Norton Plural order selecting system responsive to a plural digit number
US4975696A (en) * 1987-03-23 1990-12-04 Asinc, Inc. Real-time flight and destination display for aircraft passengers

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CH266776A (fr) 1950-02-15
FR938252A (fr) 1948-09-09
GB563524A (en) 1944-08-18
BE467205A (en(2012))
GB604297A (en) 1948-07-01

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