US838192A - Telegraphic relay. - Google Patents

Telegraphic relay. Download PDF

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US838192A
US838192A US30298506A US1906302985A US838192A US 838192 A US838192 A US 838192A US 30298506 A US30298506 A US 30298506A US 1906302985 A US1906302985 A US 1906302985A US 838192 A US838192 A US 838192A
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siphon
impulse
current
contacts
conducting
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US30298506A
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Isidor Kitsee
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WILLIAM J LATTA
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WILLIAM J LATTA
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
    • H04L25/062Setting decision thresholds using feedforward techniques only

Definitions

  • This instrument consists of stationary per manent magnets, a movable coil inthc region of tho ines of force, soft-iron core in said coil, the coil suspended by cocoonthreads, u bent-gloss tube connected to the coil and adapted to follow the inovemcntof this coil, an inlcreceptacle in which one end of this glass tubethc real siphon-is imie siphon in juxtaposition to the moving paper.
  • This si' hon has a center position which technical y is zero.
  • An impulse of one polarity moves the coil, and therefore the siphon, to the right, and an impulse of o )POSiiJG polarity moves the coil, and there ore the siphon, to the left.
  • Figure 1 a diegrammatic view of a siphonrecorder attached thereto,mydcvice in perspective and a local circuit in diagram.
  • Figs. 2, 3, 4-, and 5 are side views of the siphon with disk attached thereto; and
  • Figs. 6 and 7 are plan viewsshowin the disk, in connection with the device, a .apted to operate, through the inking movementof said disk, 9. local circuit.
  • Fig. 1 a diegrammatic view of a siphonrecorder attached thereto,mydcvice in perspective and a local circuit in diagram.
  • Figs. 2, 3, 4-, and 5 are side views of the siphon with disk attached thereto; and
  • Figs. 6 and 7 are plan viewsshowin the disk, in connection with the device, a .apted to operate, through the inking movementof said disk, 9. local circuit.
  • ' 8 is a side elevation, and Fig. 9 a top view, of
  • This dish is im mersed in. a conducting fluid 30, incloscd in a, receptacle 22.
  • the receptacle is provided with two pairs of contact-points. One is designated by 2 1 and 25, and the other pair is designated by 27 and 28.
  • 26 is an electromagnetic device provided with the two windings 3i and 32. The winding is connected, through wire 34, wit tive pole of the battery 23 and through wire with contact Contact '27 is connected, through wire 36, with the positive pole of the buttery 23. The current, therefore, if these two contacts 27 and flow throu h winding "2 in the direction of the unfeatliercd arrow.
  • the winding 31 is connected, through wire 33, with the positive pole of the battery 23 and is connected with the other terminal, through wire 37 contact 25, and contact 24 is connected, through wire 38, with the negative pole of this battery.
  • the curreru. therefore, ii the contact pairs 24 and 25 are closed, will flow through the winding the feathered arrow rection from the ll winding 32.
  • Figs. 2, 3, and 4 I have shown d ilerent modes of providing the siphon proper with the insulating material, preferably in the shape of the diskQl, and in Fig. 5 I have shown one end of the siphon broadened, so
  • this material 21 in the form of a disk.
  • this material 21 consists, preferably, of a disk of very thin mica, if the siphon of to-d try is sed; but if it is desired this si phon may be replaced by a rodor band of insulating material and integral therewith the disk 21.
  • the end of the ises rod maybe shaped so as to form this dis or the whole part representing thesiphon may be made out of mica or similar material i
  • the mode of connecting the non-conducting material 21 to the siphon proper'or the inode'of producing out of the end of the siphon the part. 21 of necessary dimension is immaterial. it only necessary that this part shall be in such operative relation .to the siphon or its substitute that the movement of this siphon shall be reproduced by its non-conduct"- ing part. a i
  • This device differs from the system used to-day in the following: To-day the siphon-recorder assumes norniallythat is, when not in use-21 zero position and is de flected to the right or left by an impulse of positive or negative polarity. To transmit a dot, an impulse of, say, a ositive polarity, is
  • a negative polarity is used, the impulse of ositive polarity deflecting or niovingthe sip on, say, to the right, and the impulse of negative polarity deflecting or moving the siphon, say, to the left.
  • a straight inky line is recorded on the moving paper.
  • Acurve to the right orleft is recorded through the deflection of the siphon.
  • the siphon must. be deflected twiceor oitener to one side before being deflected to the opposite. side,
  • the sounder of to-dsy is provided with a spring, whereby the armature, with its lever, is pulled it word when the current ceases to llow in tl ie coil. in the arrangement [LS illustrated, the spring is discarded and the second pair of tl0(.tl?ii)llll'gll-f3i S substituted therclm'.
  • the action of this sounder that when s current is flowing: through the coils of 42 the lever is pulled downwsriil, but when a current is flowing through the coils of 41 the lever is pulled upward.
  • 'lhc insfmetisin of the srmsturcs does not need to be very strong, as this magnetisin is only provided for the purpose so that the lever Shall not fell back when once moved in one position.
  • the principle of my mode of telegrsphing consists in transmitting invariably a, negiitivo impulse after a positive, or vice verso, and consists also therein that each impulse is oi the same duration and intensit I 0 that the electric condition of the cahlo rein nus practically the Siidllil l r the out the question.
  • lion aforesaid lowing over the line before the state of idleness was reached was s negative imnilse-- that is. an impulse which actuated t e electronutgnets of the sounder in u manner so as to produce the upper stroke in the lever of said sounder.
  • the lever will therefore have to rennun in this position dur ng the whole part ol the idleness 'oi the cable.
  • a siphon-recorder a non-conducting tail at one terminal of said recorder, a conducting liquid in which said tail is partly iming an lectromagnet reaching in said liquid, the IIOIl-COIlElUOElIlg tail adapted to move in the region between said. terminals and to move out of said region in accordance with the impulse actuating said siphon.
  • a receiving device such as a siphon-record er, a non-conducting tail fo vthc movable art of said device, a receptacle, a conductive iiquid for said receptacle, two pairsof contacts reaching in said liquid, an electromagnetic device, two Winding-rs for said device, a source of current, said source connectedto one Winding in opposition to the second winding, the circuit of one winding connected to one pair of said contacts, and of the second Winding: to the second pair of contacts; the non-conducting; tail reaching in said liquid.
  • said tail adopted through its movementto increase or decrease the resistance between the two contacts of one or the other of the contact pairs.
  • An electric relay comprising a receiving device, such as a siphon-recorder, anon-com ducting tail for the movable part of said device, a conductingliquidwherein said tail is immersed, terminals of two circuits in contact. with said liquid, means to center the tail between the two pairs of contacts and means i to move said tail out of the region between one pair of said contacts and farther into the region of the other pair of contacts.
  • a receiving instrument such as a siphon-rccord'er, a non-conducting body at the terminal of the siphon, a conducting liquid, terminals of an electric circuit in contact with said. liquid; the non-conducting body adapted to move in and out of the region of said terminsils, a local circuit for said terminals, a translating device and source oi current for said circuit, the movement of said non-conducting body adapted to vary the flew of current in said translating device.
  • a receiving device adapted to open and close a local circuit embracing a source of current, a translating device and conducting liquid, the receiving device provided with means, immersed in said liquid, to va'ry the flow of the current in said translating device through the changing of its position in said liquid.
  • a receiving device such as a siphon-recorder, a conducting'liquid, two pairs of terminals operatively related to said liquid, an electric circuit for each pair, a source of current and translating device for said circuits and means operatively related to the receiving instrument to vary the flow oi the current in" said circuits, in accordance with the movement of the movable part oi said rccelwng device.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Recording Measured Values (AREA)

Description

No. 838,192. PATENTBD DEG.11, 1906.
1. KITSEE.
TELBGRAPHIO RELAY.
APPLICATION FILED P5126, 1906.
3 SHEETS-SHEET 1.
% llPLIOATIOH FILED FEB. 26, 1900.
No. gamma v PATENTED DEC. 11, 1906. I. KITSBE.
TELEGRAPHIG RBLAY.-
n, I a; 7 6' Z 3 SHEETS-SHEET 2.
No. 888,192. PATENTED DEC. 11, 1906. I KITSBE TELEGRAPHIC REEKY.
APPLICATION FILED mm. 2a, 1906.
3 SHEETB-BEBET 3.
' called the niersed, the other end of ti ISIDOR KITSEE, OF PHILA .HALF TO VilLLiAM J.
DELPHIA, PENN LATTA, OF PlilLAUlilLlHlA, PENNSYLVANIA.
SSYLVANIA, ASSl'U-NOR OF ONE- TELEGRAPi-HC'RELAY.
No. see, we.
Specification of Letters Patent.
Application filed February 26,
To (tZZ witmrz, 2'!) may concern:
Be it known that I, lsroon Krrsnn, o citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Telegraphic Relays, of which the following is a specification V My invention relates to' an im r'ovemcnt telegraphic relays. Its object is to produce a relay which Without metallic contact may actuate local translating devices.
The peculiar condition or the submarine cable made it necessary to telegraph with both poles of a source oi current, one pole designating a dot and the-second pole designoting a. dash. To reccivesuchim ulses and translate the same into record, the ingenious device known as Thomsons siphon recorder is used to-day almost generally. This instrument consists of stationary per manent magnets, a movable coil inthc region of tho ines of force, soft-iron core in said coil, the coil suspended by cocoonthreads, u bent-gloss tube connected to the coil and adapted to follow the inovemcntof this coil, an inlcreceptacle in which one end of this glass tubethc real siphon-is imie siphon in juxtaposition to the moving paper. This si' hon has a center position which technical y is zero. An impulse of one polarity moves the coil, and therefore the siphon, to the right, and an impulse of o )POSiiJG polarity moves the coil, and there ore the siphon, to the left.
it is the aim instrument so as to actuate through the same it local circuit, as said above, without any nietallic connection.
Referring to the drawing: Figure 1 a diegrammatic view of a siphonrecorder attached thereto,mydcvice in perspective and a local circuit in diagram. Figs. 2, 3, 4-, and 5 are side views of the siphon with disk attached thereto; and Figs. 6 and 7 are plan viewsshowin the disk, in connection with the device, a .apted to operate, through the inking movementof said disk, 9. local circuit. Fig.
' 8 is a side elevation, and Fig. 9 a top view, of
a sounder.
' 18'is the siphonerecorder as an entirety, in which. 19 is the electrmnagnet pert, 20 the part, and 239 the sip 1011 proper. This of my invention to utilize this Patented Dec. 11, 1 06. 1906. Serial No. 302,985-
ing part, (here shown in the shape oi e disk and designated by 21.) This dish is im mersed in. a conducting fluid 30, incloscd in a, receptacle 22. The receptacle is provided with two pairs of contact-points. One is designated by 2 1 and 25, and the other pair is designated by 27 and 28. 26 is an electromagnetic device provided with the two windings 3i and 32. The winding is connected, through wire 34, wit tive pole of the battery 23 and through wire with contact Contact '27 is connected, through wire 36, with the positive pole of the buttery 23. The current, therefore, if these two contacts 27 and flow throu h winding "2 in the direction of the unfeatliercd arrow. The winding 31 is connected, through wire 33, with the positive pole of the battery 23 and is connected with the other terminal, through wire 37 contact 25, and contact 24 is connected, through wire 38, with the negative pole of this battery. The curreru. therefore, ii the contact pairs 24 and 25 are closed, will flow through the winding the feathered arrow rection from the ll winding 32.
it is now supposed that the electromegnet that is, in opposite diow of the current in the 26 is a 'olarizod reluv sda )ted to have its 8- u D armature move to one contact-point through the flow of a current of one polarity, where the armature remains until tie flow of ourrent-of opposite polarity removes the same from this contact a the opposite contact.
in other words, is a polarized relay cing the two windings is current flowing in one to the flow ol current .in the armature bf this insiphon, ctmg' part 2]., has moved to JiZ-illll) 1s, out of the region between siphon has attached to its end a nou-conduct- 5 5 pair h the nega- 28 are connected, will with 3] in the direction of ud u'ioves the some to go opposite direc- 5 ly divided between 10C remain in the attained posi- 10 the two contacts 27 and ZS-and electrically separating to greater extent the contacts 24 and 25, as is clearly illustrated in Fig. 7. The resistance between 27 and .28 will therefore be lessened and the resistance between .24:
and 25 increased. The flow of the cur-rent between the two circuits will therefore not be equal, and the greater amount of current will ilow throught-he circuit, including 37 be removed from its former position and will 1 be moved to the opposite contact.
in Figs. 2, 3, and 4 I have shown d ilerent modes of providing the siphon proper with the insulating material, preferably in the shape of the diskQl, and in Fig. 5 I have shown one end of the siphon broadened, so
as to produce out of this end the insulating material (shown as 21) in the form of a disk. in practice this material 21 consists, preferably, of a disk of very thin mica, if the siphon of to-d try is sed; but if it is desired this si phon may be replaced by a rodor band of insulating material and integral therewith the disk 21. In this respect the end of the ises rod maybe shaped so as to form this dis or the whole part representing thesiphon may be made out of mica or similar material i The mode of connecting the non-conducting material 21 to the siphon proper'or the inode'of producing out of the end of the siphon the part. 21 of necessary dimension is immaterial. it only necessary that this part shall be in such operative relation .to the siphon or its substitute that the movement of this siphon shall be reproduced by its non-conduct"- ing part. a i
In practice the inner space'of thereceptaole-22 can be very restricted. -As the movementof the siphon proper hardly exceeds one.-
eighth of an inch to one or the other side and the disk does not need to be more than from one to two inches in diameter, it is evident that the length of" this receptacle does not need to exceed two and one-half inches. It is desirable that in practice the terminals of the contacts shall be as near together as possible, and I have shown these contacts to be so far apart only for the purpose of, better illustration. It is supposed that the thickiess of the non-conducting part 21 is about one-twentieth of an inch. Then the contacts of each pair does not need to be farther apart than one-tenth. of an inch. As a conducting fluid slightly-acidulated water or a very weak solution of a caustic may be used.
1 have given these figures for the purpose that persons versed 1n the art may use the same in practicing my invention; but it is.
obvious that these figures and solutions may be varied in accordance with requirements. i prefer the form of a disk, for the reason thatthe liquid will exert a less retarding movement than if this part 21 were of any other shape. 1
' The employment of this device is of greater advantage in a system wherein true reversals are used. This system differs from the system used to-day in the following: To-day the siphon-recorder assumes norniallythat is, when not in use-21 zero position and is de flected to the right or left by an impulse of positive or negative polarity. To transmit a dot, an impulse of, say, a ositive polarity, is
1 used, and to transmits. c ash an impulse of,
say, a negative polarity, is used, the impulse of ositive polarity deflecting or niovingthe sip on, say, to the right, and the impulse of negative polarity deflecting or moving the siphon, say, to the left. In its'normal position a straight inky line is recorded on the moving paper. Acurve to the right orleft is recorded through the deflection of the siphon. In this system as some of the letters of the alphabet are symbolized by two or more dashes or dots in succession the siphon must. be deflected twiceor oitener to one side before being deflected to the opposite. side,
and as the transmitting of impulses is rapid the siphon has no time to assume its zero position between. two impulses in the same direction the movable zero 18 the result ofsuch action; but where after each, Qositive too impulse a negative nnpulse will to low," or
vice versa, the zero position remains always the-saniethat 1s, the instrument will always come to. estat its normal zero.
In one of t e experiments true. reversals 105 ceiving devioeconsisted of the usual s'iphon- I is recorder. In no instance deviated one curve from the other curve either in shape or proportion, and the line between the curves was alwa s straight and in the center, thus show ing t at with these true reversals the fear of I'I 5,
the shifting of the zero does not need to'be entertained, and considering this behavior of the si hon-recorder as a fact proven by repeate experiments it can be stated that the Working of the device, illustrated and de- 120 scribed, is as reliable as the'recording through the siphon is to-day.
In the explanation of Fig. 1 itwas stated that 26 represents a device, such a polarized relav )rovided with two windin s. Such 12 v l J a device necessitates a second translating (levicesuch, for instance, as a sounder and in some instances the interposition of a relay between the receiving device and the trans lating device proper is not desirable. I i3o iroin in its closed position till.
therefore have devised a. sounder adapted to be worked directly by the siphon-recor .ler or an instrument Sll'llllitl .in its action. This soinider, as illustrated in'Figs. and 0, cmbraces the two pairs of coils ll and 42. Esch oi the coil pairs siiruturc and us the siotion'of the coils as to the butt n 33 of opposite direction the or matures are also polarized in op osite direction. The coil pair 41 is provic ed with the polarized nrmstnre 43, and the coil pair 42 is provided with the armature 44. The sounder of to-dsy is provided with a spring, whereby the armature, with its lever, is pulled it word when the current ceases to llow in tl ie coil. in the arrangement [LS illustrated, the spring is discarded and the second pair of tl0(.tl?ii)llll'gll-f3i S substituted therclm'. The action of this sounder that when s current is flowing: through the coils of 42 the lever is pulled downwsriil, but when a current is flowing through the coils of 41 the lever is pulled upward. 'lhc insfmetisin of the srmsturcs does not need to be very strong, as this magnetisin is only provided for the purpose so that the lever Shall not fell back when once moved in one position. I
I will now describe the operation of the sip hon-recorder in connection with the sounder, as illustrated in Figs. 8 and .9. his neces first of all to state the mode of telegoiphing.
ln con'trsclistinction from the telegraphing of today, whii-rcin for some letters in the elphshet two or more positive impulses or two or more negative impulses are transmitted over the line, the principle of my mode of telegrsphing consists in transmitting invariably a, negiitivo impulse after a positive, or vice verso, and consists also therein that each impulse is oi the same duration and intensit I 0 that the electric condition of the cahlo rein nus practically the Siidllil l r the out the question. transmit one impulse of, my, positive polarity to bring the instrument in the cable-circuit to a position so iii: to close u local circuit containing s trons-lath device. and this trunsloting dcvico of such it structure that it has to reen-inipulsc oi, sou, negative polarity trni'isinittcd over the line, whereby :1 second local circuit is closed, altering the position of the translating dc- Vice in u irsnuer so as to plur'e the some in a. so-cnllcd open position or at position indicating n space.
it sup; ised the. tire lino is idle, no impulse flow-i r over the some. ln. this state ill? siphon or simi provided with o polsrized I i role working time, and the shifting of the 1 l l l l l l r l r l l i l i l lur part of t e receiving dc- 1 nos iiisorioo in the table s'st the zero posij iioo. 'll roii l: 4, 4 a. will! ii. tin lic 'iiimn ill-P supposed tun;
i purtoi' i-l't siphon isccntercd :onturt puns. it
- lust impulse which was this position the lower or. as l l is also j strokes a dot.
lion aforesaid lowing over the line before the state of idleness was reached was s negative imnilse-- that is. an impulse which actuated t e electronutgnets of the sounder in u manner so as to produce the upper stroke in the lever of said sounder. The lever will therefore have to rennun in this position dur ng the whole part ol the idleness 'oi the cable.
supposed that ii positive impulse is transmitted over the line deflecting the tail end of i The impulse trii nsinitted over the cable is only lnorneizturv, and the siphcnwill, as soon as this impulse has passed, resume its center' position, whereby the current-flow in, both circuits of the sounder is made equal. No force therefore present to remove the lever from its upper position, and the some will remain there till a negative impulse will energize the other coil pair so as to produce it downward movement of theleverof this sounder. Nowit is supposed that the operator desires to transmit a dot. Ho transmits a positive impulse and in a short space of'tiino a negative impulse. Through the send' g of the first impulse sound cr will give ud ownstrohe, and through the sending of the second impulse the lever will give on upper stroke, and as between these two strokes it short timeclapses. the receiving operator will translate these two In trsusmiti operator first sends inpositive impulse over the line and uftern period of more then one unit of time a negative impulse, and the sounder will work in the some munneras if a dash would have been sent over the lino--- thu-t is, the lever will remain in. its downward position for a length of time equal to the time denoting a. dash.
I have illustrated and described the device uscmployed tods 'v in cable telegraph), not cluinging any part of this device with the exception of the condition of the insulating; disk, so that the proper officers shall be en-- ubled to receive or relay impulses transmit tod over :i cslelc with the aid of an lIlSlJI'lk ment, the working of which they are familiar with. It obvious that this instrumentcen zit one and the ,iii'ine time record as well us translate in sound the received impulses.
l have described my invention in conncction with usiphon-recor ler, the some being to-dny centered or lutvingwhzit is technically called the zero position. Thisposition is due to s siniill might and sonictiniestou light spring holding the siphon inthe posh Should this weight or spring b0 romoved, then the siphon would test sidewisc to left or right in :wcordonce movement of the coil.
t is obvious that any olcc'iriunugnetic de- It is now the lever of the,
ing a. (lush the wi th. the
' mersed, terminals of lectric circuit containvice With or without a cent-er position may be used with this my invention, the siphon-rccorder, as stat-ted shove, being preferred hecause the some was found cliicient after an experience of many years.
Having now described my invention, what I claim as new, and desire to secure by Let tors Patent. is
1. A siphon-recorder, a non-conducting tail at one terminal of said recorder, a conducting liquid in which said tail is partly iming an lectromagnet reaching in said liquid, the IIOIl-COIlElUOElIlg tail adapted to move in the region between said. terminals and to move out of said region in accordance with the impulse actuating said siphon.
2. A receiving device, such as a siphon-record er, a non-conducting tail fo vthc movable art of said device, a receptacle, a conductive iiquid for said receptacle, two pairsof contacts reaching in said liquid, an electromagnetic device, two Winding-rs for said device, a source of current, said source connectedto one Winding in opposition to the second winding, the circuit of one winding connected to one pair of said contacts, and of the second Winding: to the second pair of contacts; the non-conducting; tail reaching in said liquid. said tail adopted through its movementto increase or decrease the resistance between the two contacts of one or the other of the contact pairs.
3. An electric relay comprising a receiving device, such as a siphon-recorder, anon-com ducting tail for the movable part of said device, a conductingliquidwherein said tail is immersed, terminals of two circuits in contact. with said liquid, means to center the tail between the two pairs of contacts and means i to move said tail out of the region between one pair of said contacts and farther into the region of the other pair of contacts.
4. In combination with an electric cable, a receiving instrument, such a siphon-rccord'er, a non-conducting body at the terminal of the siphon, a conducting liquid, terminals of an electric circuit in contact with said. liquid; the non-conducting body adapted to move in and out of the region of said terminsils, a local circuit for said terminals, a translating device and source oi current for said circuit, the movement of said non-conducting body adapted to vary the flew of current in said translating device.
5. In combination with an electric cable, a receiving device adapted to open and close a local circuit embracing a source of current, a translating device and conducting liquid, the receiving device provided with means, immersed in said liquid, to va'ry the flow of the current in said translating device through the changing of its position in said liquid.
6. In cable telegraphy, a receiving device, such as a siphon-recorder, a conducting'liquid, two pairs of terminals operatively related to said liquid, an electric circuit for each pair, a source of current and translating device for said circuits and means operatively related to the receiving instrument to vary the flow oi the current in" said circuits, in accordance with the movement of the movable part oi said rccelwng device.
in testimony whereof I 111 presence of two witnesses.
. ISIDOR KITSEE.
Witnesses: 1 r; MARY (7, Sn rn,
ALvAir Rrr'rENnoUsE.
afiix my signature
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2741728A (en) * 1952-08-29 1956-04-10 Ericsson Telephones Ltd Polarized electromagnetic devices
US2794157A (en) * 1952-12-30 1957-05-28 Allen E Chisholm Polarized snap action magnetic switch
US3048678A (en) * 1960-06-10 1962-08-07 Space Components Inc Magnetic relays

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2741728A (en) * 1952-08-29 1956-04-10 Ericsson Telephones Ltd Polarized electromagnetic devices
US2794157A (en) * 1952-12-30 1957-05-28 Allen E Chisholm Polarized snap action magnetic switch
US3048678A (en) * 1960-06-10 1962-08-07 Space Components Inc Magnetic relays

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