US1837236A - Impulse sender - Google Patents

Impulse sender Download PDF

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Publication number
US1837236A
US1837236A US425422A US42542230A US1837236A US 1837236 A US1837236 A US 1837236A US 425422 A US425422 A US 425422A US 42542230 A US42542230 A US 42542230A US 1837236 A US1837236 A US 1837236A
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US
United States
Prior art keywords
pin
arm
pawl
shaft
normal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US425422A
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English (en)
Inventor
Sengebusch Hans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Reserve Holding Co
Original Assignee
Reserve Holding Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE376876D priority Critical patent/BE376876A/xx
Application filed by Reserve Holding Co filed Critical Reserve Holding Co
Priority to US425422A priority patent/US1837236A/en
Priority to GB38070/30A priority patent/GB368862A/en
Priority to FR711859D priority patent/FR711859A/fr
Application granted granted Critical
Publication of US1837236A publication Critical patent/US1837236A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/272—Devices whereby a plurality of signals may be stored simultaneously with provision for storing only one subscriber number at a time, e.g. by keyboard or dial

Definitions

  • a device of that character which is known in the telephone art as a calling device, is
  • Fig. 2 is a rear view of the im ulse sender
  • Fig. 3 is a side view of the locatingl side of the iEInpulse sender, with respect to its position in Fig. 4 is a view of the right side of the impulse sender, with respect to its position in Fig. 1, with the upper portion of the sender omitted;
  • each one of these keys operates one pin in each arcial row of pins in the pin board, shown in Fig. 7, which, as will be described in detail later, controls the olf-normal operation of the calling device 42.
  • a shaft 16 which is journaled at its ends in the mounting plates 2 and 3, is held in the journals by means of the collar 17, Fig. 3, and the collar 18 best seen in-Fig. 5.
  • the shaft 16 extends through the mounting plate 2 for a distance sulicient to receive the hub 19 which is secured to the shaft 16 by means of a set screw.
  • a plurality of keys similar to typewriter keys are provided and are desi ated by numerals 1 to 0, inclusive, and tart and Error.
  • the horizontal arms of 'these keys project through the vertical slots 38 in the front mounting plate 2 and extend toward the rear of the sender, where, at their rounded ends, they are pivotly mounted upon the shaft 45.
  • the shaft 45 is mounted in a block 44 secured to the base plate 1, which block has a series of vertical slots which receive the ends of the horizontal arms of the keys. These slots are slightly wider than the horizontal arms of the keys are thick so as to allow rotary motion of the arms about the shaft 45, but narrow enough to prevent any lateral motion of the arms.
  • the material of the blocks between the slots serves to hold the keys in spaced relation with each other. This mounting arrangement of the horizontal arms of the keys is best seen in Figs. 3, 4, and 6.
  • the bar 8 at its left end is secured to the front plate 2 by means of screw 9 and at its right end is bent to fit into a small aperture in the plate 2.
  • the spring 10 serves to restoritthe error key to its normalposition whenreleased after having been depressed and is a stronger spring than the spring 7 since more influence must be exerted upon the error key to return it to its normal position as will be understood later.
  • the tooth 39 which blocks the motion of the 0 digit key is wider than the others and is provided with the slanting edge 40.
  • rllhe lever 32 is pivotedv at 3 3 on the front plate 2 and at its lower end is provided with a slot which cooperates with the pin 34 of the plate 35 and serves when the upper end is pressed downward to 'move the plate 35 to the left to place the teeth 39 into position to lock the keys from operation.
  • Lever 32 may be locked in its operated position,
  • the instrument of the hand o'r cradle type could be used and employed as the means for locking the lever 32 in position to prevent operation of the digit keys. In that arrangement, removal of the instrument from the cradle would allow the spring 33 to restore the lever and remove the blocking teeth 39 from underthe digit keys.
  • the pin board best seen in Fig. 7 is of a hollow'or box-like construction and is made from the two plates 49 and 50 and the separating member 51.
  • Each ⁇ of the'plates49 and 50 is provided with eight arcial rows of tenholes, the holes in plate 49 being in cooperative relation with the holes in plate 50 so that pins inserted in the corresponding holes of the two plates may protrude on both sides of the box-like construction.
  • Each of the pins inserted in these holes has 05 a shoulder mid-waybetween extremities
  • the member 51 is shorter in 1length than either of the members 49 or 50.
  • a trough is provided at .either end of the pin board so that the pin board can be moved upward'and downward on the shaft 54, Fig. 3, and the shaft 55, Fig. 4, which shafts are so positioned as to 'fit within the troughs.
  • the right end of the pin board, with respect to its position in Fig. 7, is provided with two members 52 each having a hole therein to receive the shaft 55 .to
  • the shaft 54 is secured at its lower endv in the base plate 1 and at its upper endin apiece secured to the cross brace 5, while the shaft 55 is secured at its lower end in the base plate 1 and at its upper end in a piece secured to t-he cross brace 6.
  • a bracket having a horizontal piece 58 extending under alll of the horizontal arms of the digit keys l to 0, inclusivefand having two side arms 58, Fig. 3, and 59 similar to 58 and seen in cross section in Fig. 6, has the ends of these arms rotatably mounted on the shaft 45 as are the horizontal arms of the digit keys'.
  • Each depression of one of th e digit keys 1 to 0, inclusive causes the horlzontal arm of that digit key to engage the horizontal cross piece 58 of the bracket to carry that bracket downwardl with its own downward movement.
  • the key is released and returned to its normal position by ing the side arms 58 and 59 and the horizontal cross piece 58', returns the bracket to the position ⁇ from which it was moved by the depression of the digit keys.
  • a holding pawl 61 is rotatably mounted intermediate its extremities at 62 on the cross brace 6 and has a projecting piece 61 which engages a tooth of the ratchet 53 to hold the pin board in position during the downward movements of pawl 57.
  • Pawl 61 ⁇ is held in operative relation with ratchet 53 by means of coil spring 63. i i
  • Each end 67 is positioned in relative position-with one of the vertical rows of pins.
  • the end 67 of the digit key No. 1 is lin relative position with the left end vertical row of pins
  • the end 67 ofthe digit key No. 2 isin relative position with the second .from the left vertical row of pins
  • end 67 lof 'digit key No. 3 is in relative position with the third from the left vertical row of pins, etc.
  • each end 67 is in operative relation with'the first or upper-most pin in its4 associated vertical row.
  • the start key is also provided with an upwardly projecting arm designated in Figs. 4. and 6 by reference numeral 69, which projecting arm has been rearwardly bent to form the part 7 0 which carries the projecting piece 72.
  • the rearwardly extending portion 70 of the arm 69 carries the roller bushyare insulated from each other, which assembly is secured to the rearward mounting plate 3 by means of screws 85 and 86.
  • the metal piece 84 which is included as a part of the spring assembly and which is located between the contact: springs 77 and 78 forms a stop for the spring 77 to insure separation of the contact springs when they are allowed to disengage each other as will be explained subsequently.
  • a U-shaped holding pawl having the two arms 73 and 7 3 is rotatably mounted on the cross brace 6, with one arm on either side of the cross brace, by means of the pin 7 4 which extends through the cross brace 6.
  • a leaf y 72 of the start key as best seen Iin Fig. 4.
  • a second U-shaped pawl arrangement having the arms 79 and 80 is rotatably mounted on the arm 69 of the start key at 81.
  • the arm 79 abuts a projecting piece on the plate of the pin board to prevent depression of the start key.
  • the arms 79 will no longer abut the projecting piece of the plate 50, so that the operation of the start key is noW permissible.
  • the free end of the yarm 8() has a piece cut out of the upper edge thereof to form a step which is adapted upon movement of the start key to engage the projecting piece 83 yof the holding p awl 61.
  • ⁇ 'Ihe free end of the arm 80 is held against the under edge of the projecting piece 83 by means of the coil spring 82 attached to the member' 69 and to the end of the U-member comprising arms 79 and 8() on the other side of the pivot 81.
  • a mounting bracket 95 secured to the rear side of the front mounting plate carries a rod 94 slidably mounted in the mounting bracket 95.
  • This rod 94 at its left end, Fig. 3, carries a pin restoring plate 99 which has sulicient surface to cover all of the pins in the pin board.
  • the pin-restoring plate 99 engages those pins which are in their operated positions ⁇ and pushes them into the pin board into the position from ⁇ dium of the slot and the pin 98 moves the rod 94 to the left to perform the pin-restoring operation.
  • a coil spring about the rod 94 and between the 4end of the bracket 95 and the pin 98 exertsopressure to restore the rod 94 and the pin-restoring plate to the position shown in the drawings.
  • a lever 87 which is pivoted 'at one of the ends by screw 88 which is secured in the front mounting plate 2, has al U-shaped bend intermediate its ends to t around-the mechanism comprising thebracket 95, the rod 94 and the angular lever 96.
  • This lever 87 has an extension forming the pinY 100 which tits in the slot in the other arm of the angular bracket 96.
  • the spring on the rod 94 not only restores that rod to its normal position but also through the reverse rotation of the angular lever 96 restores the lever 87 with the aid of gravity to the position in which that lever is shown in Fig. 5.
  • the pin-restoring plate 99 near its lower edge carries the pin 101 which slides 1n a hole in the lower art of the bracket 95 to prevent rotation o the rod 94.
  • a pawl member having the three arms 90, 91, and 92 is rotatably mounted at the hub of these three arms to the free end of lever 87 by means of the screw 89.
  • a coil spring 93 secured at one of its ends to the end of arm 90 and at its other end to the lever 87, holds the arm 92 against the horizontal arm of the error key.
  • the arm 92 near its lower extremity is provided with a shoulder, which, when the error key is depressed, slides over the upper surface of the horizontal arm of the error key so that when the error key is released and returned to its normal position under the iniiuence of the coil spring 10, the pawl member of which the arm 92 is a art, and consequently the free end of the ever to which this member is fastened, is lifted by the horizontal arm of the error key.
  • a push rod 118 is excentricaly attached to the end 116 of the spool 112 by means of the pivot screw 117. Rotation of the spool 112 transmits a vertical reciprocating motion to the push rod 118.
  • the push rod 118 near its free end, is provided with a shoulder 120.
  • the free end of the push rod 118 is inserted through a hole in the cross arm 58 of the pin board elevating bracket and in a hole in the base plate 1.
  • Downward movement of the push rod 118 caused by the excentric action between the end 116 of spool 112 and the pivot screw 117 upon the rotation of spool 112, causes the shoulder 117 to engage the cross arm 58 and push the cross arm downward as was done by the operation of one of the digit keys as described, to move the operating pawl 57 into engagement with another tooth preparatory to the elevation of the pin board one step upon the return-to-normal movement of the bracket under the influence of s ring 11 as described.
  • the push rod 118 wille returned to its normal position, that is, to the position in which it is shown in Fig. 5, by the continued eXcentric movement of the end 116 and the pivot screw 117.
  • each revolution of the spool 112, and consequently vthe end 116 operates the pin board elevating bracket, comprising the cross arm 58 and the two side arms 58 and 59, to elevate the pin board one step for each of those revolutions.
  • a holding pawl 121 having the side projecting pieces 121 and 125, is rotatably mounted on the rear side of thefront mounting plate 2 at 123.
  • the side projecting piece 125 extends through an aperture in the front mounting plate 2 and the end 124 of the holding pawl 121 abuts the side of the aperture and is normally held against that side by' means of the leaf spring 122 which at one of its ends is secured to the paw 121 and which at its other end bears against the cross brace 5.
  • the downward pull exerted on the push rod 118 by the spring 119 causes the spool to be rotated through an angle suiicientto place the pin 115 in such position that when the pawl 121 is returned toits normal position under the inliuence of spring 122, the pin 115 will be free of the side projecting piece 121.
  • the amount of rotation of the spool 112 under iniuence of rod 118 and spring 119 is governed in a manner which willy be explalned subsequently.
  • spool-like member 126 Rotatably mounted uponlthe shaft 16 between the collars 18 and 130 iusjay spool-like member 126, one of whose ends carries the gear teeth 127 and the other of whose ends carries the ratchet teeth 128.
  • the central or hub portion of the spool 126 carries the rubber tire 129.
  • the gear teeth 127, and gears 140 and 141 which are mounted upon the same hub on axle 142 secured to the front mounting plate 2, and by means of the pinion gear 143 which comprises a part of the reduction geaiV train enclosed in the gear housing 14, the spool 126 is rotated in a clockwise direction about the shaft 16 by the motor 12.
  • the end 113 of the spool 112 is provided with a flat side, which when the spool is in its normal position as shown in Fig. 5, the llat spool 112 is in operative relation with the rubber tire 129 carried by the spool 126.
  • the spool 126 will rotate without any influence upon the spool 112.
  • the flat side of the end 113 is moved out of its adjacent position with the rubber tire 129 and the knurled periphery of the end 113 is moved e .ment of the knurled portion of end 113 with the rubber tire 129 will cause the spool 112 to berotated about axle 114 by the spool 126 in a counter-clockwise direction.
  • the collar, or hub, 130 has as a rigid vpart thereof, the pawl carrying member 131 which carries at its free end the pawl 133 which is rotatably mounted thereon by means of the pin 134.
  • Pawl 133 has the pin engaging arm 138, the ratchet tooth engaging arm 139, and the operating arm 137.
  • En agement of the operating arm 137 and the p1n 115 rotates the pawl 133 in a clockwise direction, with respect to its position in Fig. 5, about its axis 134 to move the ratchet tooth engaging end 139 into engagement with a tooth of the-ratchet teeth 128 carried by the ⁇ spool 126.
  • the arm 139 In the normal position of the pawl 133, the arm 139 is out of engagement with the ratchet teeth 128.
  • This cycle of operation is as follows, assuming the motor to be running and consequently the spool 126 to be rot-ating:
  • the pawl 121 is rotated to free the pin 115 to allow the spring 119 to move the spool 112 to place it under control of spool 126.
  • Spool 112 is then rotated by the spool 126 to move the push rod, and consequently the bracket of which cross arm 58 is a part, downward and to cause the pin 115 to engage the operating arm 137 of the pawl 133 to rotate the pawl and place the arm 139 thereof in engagement with the ratchet teeth 128.
  • the calling device 42 operates its impulse springs ten times to transmit ten impulses.
  • the remaining pins of the row intermediate the first and tenth pins are so spaced to govern the offnormal rotation of the shaft 16 that the return-to-normal movement thereof causes the calling device 42 to transmit a number of impulses in accordance with the number of the pin in the row, which was moved to its operated position.
  • the stop piece 28 carried by the lever 26 will be in position to engage the arm -23 of the spider wheel to stop the shaft 16 in yits normal osition.
  • the sha t 16 and the s ider Wheel attached thereto are provide with an initial off-normal movement which is the reverse ofthe off-normalmovement of the calling device 42 preparatoryl to the impulse transmitting operation for a purpose which will y now be described.
  • the collar 18, Fig. 5 has been provided with a shoulder 18 and a lifting lever 146 has been rotatably secured to the lever 87 by means of a screw 147.
  • FIG. 8 A modification of the startl control mechanism operated by the start key is shown in Fig. 8, in which figure the primed numerals designate parts corresponding to similar parts in the preferred embodiment just described.
  • the initial offnormal movement of the shaft 16 and the spider wheel is eliminated.
  • the lever 26 instead of being pivoted at one of its ends is centrally pivoted at 27 on the front mounting plate 2 andis controlled by the start key through the connecting rod 29 in the manner similar to that in which lever 26 is controlled by the start key.
  • Arm 21 is used to operate the fiber member 24 from its normal position, arm 22 as before is used to move the ber member 24 back to its normal position, in which position it causes engagementl between the contact springs 30 and 31, and arm 23 'engages the arm 62" of the holding awl 61 to release the pin board as before escribed.
  • Spool 112 immediately begins to rotate Vwith the spool 126 and the push rod 118 operates the pin board elevating bracket comprising the side arms 58 and 59 and the cross piece 58', to elevate the pin board one step to thereby place the first arcial row of pins in the path of the pin-engaging arm 138 of the pawl 133 so that the operated pin in that row will be in position to be engaged by the arm 138.
  • the rotation of spool 112 causes the pin 115 carried by the end 113 to engage the operating arm 137 of pawl 133 to rotate' the pawl about its pivot 134 to move the arm 139 into engagement with the ratchet teeth 128 of spool 126.
  • Pawl 133 immediately begins to move with the spool 126 and by means of the arm 131 causes the Arotation of shaft v16 with the spool 126.
  • v Y p Spool 112 continues its rotation until the pin 115 engaged the projecting arm 121 of the pawl 121.
  • the calling device 42 transmits a number of impulses corresponding to the pin operated or to the digit key depressed for the first digi-t of the telephone number.
  • This cycle of operations is performed for each digit of the telephone number.
  • the pin-- engaging arm will be moved until it engages the stop pin 144.
  • This movement of the shaft 16 causes the gear segment 103 to engage the arm 73 of the double-armed pawl and move the arm 73 to free the end 72 of the start key, thereby allowing the springs 77 and 78 tovseparate .to ⁇ open the motor circuit, and the spring 78 to restore the start key to itsnormal position.
  • the 'arm 22 of the spider wheel operates the ber# member 24 to move the contact spring 31 into engagement with con# .tact spring 30 to place a shunt about the impulse springs lof the calling device to tplil'cvent transmls'sion of impulses upon the al return-tonormal movement o f the shaft 16 and consequently the callingvdevice 42, and
  • the arm 23 of the spider wheel operates the y
  • the piece 105 carried by the gear segment 103 passes the end 107 of spring 106 a very slight distance so that when the shaft 16'is released from the control of spool 126 its return-tonormal movement will be prevented by the engagement of the piece 105 with the end 107 of spring 106 until the pin board has dropped to its normal position to move the spring 106 to release the shaft 16 by the operation of the lever comprising arms 109 and 108.
  • impulse generating means having a normal position, an electric motor, means controlled by the motor for operating said generating means from its normal position, a plurality of digit keys, means operated by the operation of a plurality of said keys for manipulating said motor controlled means to cause it to operate said generating means from its normal "position a number of times corresponding to the number of said keys operated, and means for returning said generating meansto its ⁇ normal position after each oH-normal operation to thereby generate series of impulses corresponding to the digits represented by the operated keys.
  • impulsegenerating means an electric motor, means controlled by said motor for operating said generating means, a plurality of digit keys, and a pin board having a plurality of rows of pins, one pin in each row for each key, successive operations of a plurality of said keys moving one pin in each row Vto an operated position for manipulating said motor controlled means to cause that means to operate said generating means a number of times corresponding to the number of pins operated to generate serles of lmpulses corresponding to v ⁇ the digits represented by the operated keys.
  • an impulse sender a row of pins having operated positions, a plurality of digit keys operable to move 'said pins to their operated positions, one key for each pin, an impulse generator, an electric motor, and a pawl and ratchet arrangement operated by said motor and manipulated by an operated one of said pins for operating said impulse generator to generate a series of impulses corresponding to the digit key associated with said operated pin.
  • an impulse sender a pin board having a plurality of rows of pins, a plurality of digit keys normally in operative relation with one of said rows and operable to move the pins of that. row to operated positions, there being one key for each pin in 'a row, means operated by the operation of any one of said keys for elevating said pin board to place another row of'pins in operative relation with said keys, an impulse generator, an electric motor, and a, awl and ratchet arrangement operated Ifly said motor and manipulated by the operated ones of said pins for operating said generator a number of times corresponding to the number of keys operated to generate series of impulses corresponding-to the digits represented by the operated digit keys.
  • a pin board having a pluralityof rows of pins, a plurality of digit keys normally in operative relation with one of said rows and operable to move the pins of said row to operated positions, there being one key for each pin in a row, means operated by the operation of any one of said keys for elevating said pin board to place another row of pins in operative relation with said keys, an impulse generator, an electric motor having circuit closing springs, means for operating said springs to close the circuit of said motor to start the voperation thereof and for restoring the elevated pin board, a pawl and ratchet arrangement operated by said motor and manipulated by the operated pins one at a time to operate said impulse generator a number of times to generate with each operation aI series of impulses corresponding to the digit key associated with the manipulating pin, and means automatically operated after each manipulation of said pawl'and ratchet arrangement for operating said elevating .means to elevate the pin board to place the operated pin of the succeeding row in position to manipulate said arrangement.
  • an impulse generator having a normal position, an electric motor, a shaft geared to said generator, a ratchet wheel rotatably mounted on said shaft and rotated by said motor, a pawl cartion, a digit key, means operated by said tid titi
  • an impulse generator In an impulse sender, an impulse generator, means for operating said generator, a row of pins, and a digit key foreach of said pins and operable to move the associated pin to an operated position for lcontrolling said means to cause said generator to generate a number of impulses corresponding to the Jdigit represented by that key.
  • an impulse generator having a normal position
  • an impulse generator having a normal position
  • means for moving said generator from its normal position means including keys and manipulated by the operation of one of said keys for controlling the off-normal movement, and means for returning said generator to its normal position to thereby generate a number of impulses indicative of the key operated.
  • an impulse generator adapted to return to a normal position under its own power after being moved from its normal position and to generate impulses varying in number according to the extent of the oi-normal movement, and mea-ns operated by an electric motor and controlled by keys for moving said generator lvarying -distances from its normal position.
  • al rotatable impulse generator having a normalposition
  • means operated by an electric motor and controlled by keys for rotating said generator variable distances from its normal position
  • a pin-board having a plurality of rows of pins, a plurality of digit keys normally in operative relation with the pins of one of said rows and operable to move the pins of that row to operated positions, there being one key for each pin in a row, means operated by the operation of any.
  • one of said keys for moving said pin-board to place another row of pins in operative relation with said keys, an impulse generator, an electric motor, a pawl and ratchet arrangement operated b said motor and manipulated by the operate ones of said pins for operating said generator a number of times corresponding to the number of keys operated to generate a corresponding number of series of impulses corresponding to the digits represented by the operated digit keys, and means effective after said generator has been operated said corrsponding number of times to restore the operated ones of said pms.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Transmission Devices (AREA)
  • Lock And Its Accessories (AREA)
  • Mechanical Control Devices (AREA)
US425422A 1930-02-03 1930-02-03 Impulse sender Expired - Lifetime US1837236A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE376876D BE376876A (en(2012)) 1930-02-03
US425422A US1837236A (en) 1930-02-03 1930-02-03 Impulse sender
GB38070/30A GB368862A (en) 1930-02-03 1930-12-17 Improvements in or relating to impulse transmitters for use in telephone or like systems
FR711859D FR711859A (fr) 1930-02-03 1931-01-31 Perfectionnements aux émetteurs d'impulsions notamment aux émetteurs d'impulsions à clavier pour opératrice

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US425422A US1837236A (en) 1930-02-03 1930-02-03 Impulse sender

Publications (1)

Publication Number Publication Date
US1837236A true US1837236A (en) 1931-12-22

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Application Number Title Priority Date Filing Date
US425422A Expired - Lifetime US1837236A (en) 1930-02-03 1930-02-03 Impulse sender

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US (1) US1837236A (en(2012))
BE (1) BE376876A (en(2012))
FR (1) FR711859A (en(2012))
GB (1) GB368862A (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434959A (en) * 1945-09-15 1948-01-27 Bell Telephone Labor Inc Call transmitter for interstate telephone communication

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558827A (en) * 1947-08-09 1951-07-03 Haven Benjamin H De Ash receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434959A (en) * 1945-09-15 1948-01-27 Bell Telephone Labor Inc Call transmitter for interstate telephone communication

Also Published As

Publication number Publication date
GB368862A (en) 1932-03-17
FR711859A (fr) 1931-09-19
BE376876A (en(2012))

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