US2305450A - Relay - Google Patents

Relay Download PDF

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Publication number
US2305450A
US2305450A US389322A US38932241A US2305450A US 2305450 A US2305450 A US 2305450A US 389322 A US389322 A US 389322A US 38932241 A US38932241 A US 38932241A US 2305450 A US2305450 A US 2305450A
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United States
Prior art keywords
reed
laminations
lamination
field
relay
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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
US389322A
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English (en)
Inventor
George R Stibitz
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AT&T Corp
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Bell Telephone Laboratories Inc
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Filing date
Publication date
Priority to NL78933D priority Critical patent/NL78933C/xx
Priority to BE468901D priority patent/BE468901A/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US389322A priority patent/US2305450A/en
Priority to GB7161/42A priority patent/GB551433A/en
Application granted granted Critical
Publication of US2305450A publication Critical patent/US2305450A/en
Priority to FR943612D priority patent/FR943612A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/62—Co-operating movable contacts operated by separate electrical actuating means

Definitions

  • This invention relates to switching devices and more particularly to relays each capable of performing the functions of a plurality of relays of the usual type.
  • the relay structure disclosed in the application of C. N. Hickman and E. Lakatos, Serial No. 367,338, filed November 27, 1940, is provided with a plurality of magnetic circuit units each comprising a fixed field lamination and an armature lamination having a reed armature portion attractable into conductive engagement with the associated field lamination. Since the reed armatures of all of the units of the relay are encircled by a single operating coil, the energization of such coil causes the attraction of all of the reed armatures to their associated field lamihations, thus closing a plurality of work circuits.
  • the relay may become a radically different device with no equivalent among relays of the wellknown conventional types. It can be made to take the place of two conventional non-polarized relays and by combining the magnetic paths of the relay, 8. single reed armature can be made to take the place of several springs on separate relays. Furthermore, because the functionally independent reed armatures are mounted adjacent to each other in close proximity they may be so intercoupled as to enable still further switching functions to be accomplished by a single relay structure.
  • This object is attained by grouping the field laminations in two groups, associating an energizing coil with each of such groups and arranging the armature laminations in such a manner that the reed armature portions thereof may be attracted into conductive engagement with associated field laminations of either group.
  • the object of the invention is further attained by attaching studs of insulating material to the reed armatures in such a manner that with all of the armatures in their normal positions, the free end of the stud of each armature just engages against the adjacent face of the adjacent armature whereby an interaction between the armatures is secured.
  • a relay may comprise a single armature lamination and three field laminations, two in one group energizable by one energizing coil and located one above and the other below the armature lamination and the third field lam- Cir ination in a second group and energizable by the second energizing coll.
  • the reed can be attracted into conductive engagement with both of the upper laminatlons by the energlzatlon oi the coil associated with the second group or held laminatlons and will be held in engagement by the continued enel'glzatlon 01' such can or by the subsequent energlzatlon of the other coil.
  • a relay with three held lamlnatlons 9. smgle reed and two coils could pel'iol'm all of the Iunctlohs OI three conventional relays equipped with an aggregate or ten contact springs.
  • a relay may, by the provision of twenty or such sets or held lamina-Lions and reed armatures, that is with sixty held laminations and twenty reed armatures, with two energizing coils and with the armatures intercoupled by insulating studs perlorm the lunctions of the well-Known counting relay chain having twenty separate relays carrying ten tl'ansier contact sets of three contact springs each and ten pairs or make contact springs or a total or eighty springs and. the same number of soldered connections thereto as contrasted with four soldered connectlons in the proposed relay.
  • Fig. 1 is a perspective view of a relay of the type comprehended by the present invention
  • Fig. 2 IS a partially exploded View or the relay of lug. l. more clearly disclosing certain assembly element's thereof;
  • Fig. 3 is a front end view of the relay of Fig. 1;
  • Fig. 4 is a simplmed circuit diagram embodying the relay structure of Fig. 1;
  • Fig. 5 is a circuit diagram illustrative of the association. or conventional relays all or the functions of which are accomplished by the re- I lay structure illustrated in bugs. 1. to 5, inclusive,
  • Fig. ii is a circuit diagram embodying a modificatlon of the relay structure
  • Fig. 7 is a circuit diagram illustrative of the association of conventional relays all of the functions of which are accomplished by the relay illustrated in Fig. 6;
  • FIG. 8 shows an armature lamination of the relay equipped with a coupling stud for use in a counting relay structure
  • Fig. 9 is an end view of the lamination disclosed in Fig. 8.
  • r Fig. 10 is a circuit diagram embodying the invention in which two reed armatures of the type disclosed in Figs. 8 and 9 are coupled together;
  • Fig. 11 is a circuit diagram illustrating the association of conventional relays all of the functions of which are accomplished by the relay illustrated in Fig. and
  • Fig. 12 is a circuit diagram illustrating the embodiment of the invention capable of countme a plurality of impulses and closing work circuits in response thereto.
  • the field laminations may pass through either the right or the left energizing coil and may be positioned either above or below the armature.
  • the armature reed may be arranged with its normal position either midway between the upper and lower laminations or may be allowed to rest on one or the other.
  • the reed armature may be considered to be acted upon by three forces; its own stillness, a magnetic force U tending to move the reed upwardly and a magnetic force D tending to move the reed downwardly.
  • a field lamination may be placed either above or below the reed armature or laminations may be placed both above and below the associated reed armature and they may pass through either the left or right coils.
  • These possible field laminations may be designated UR if above the reed and extending through the right coil; UL if above the reed and extending through the left coil; DR if below the reed and extending through the right coil and DL it below the reed and extending through the left coil.
  • the lamination may also be considered as coupling the coils R and L to the magnetic circuits U and D.
  • the positions or the reed will be specified by giving the hindrances xi, :2: an or the trout or upper contacts of two position springs. Reeds with three positions require two hindrances .r and y to define their positions where x and y are the hindrances of contacts on the tops and bottoms of the reeds, respectively.
  • :r (or m, y) is determined by X (or X, Y), the initial value of m, and by the values of U and D.
  • a table or an algebraic expression may be constructed, with X (or X, Y), U and D as independent variables and a: (or at, :u) as dependent variables.
  • Figs. 1 to 3, inclusive disclose the relay structure diagrammatically illustrated in Fig. 4.
  • This structure is provided with an upper left field lamination I and an upper right field lamination 3 positioned side by side but out of conductive engagement with each other, a single lower left field lamination 2 and a right spacing lamination 4 positioned side by side but out of conductive engagement with each other and an armature lamination 5 of the shape disclosed most clearly in Fig. 8 having a forwardly extending reed portion 6 interposed between the upper field laminations 1 and 3 and the lower field lamination 2 and spacer 4.
  • the armature lamination 5 is insulated from the field laminations by interposed laminations l of insulating material. Outside of the field laminations l and 3, at one end of the assembly, and insulated therefrom by the lamination 8 of insulating material are positioned side by side but out of engagement with each other, a coil terminal member 9 and a spacing member [0. Outside of the coil terminal member 9 and the spacing member ID, two other coil terminal members II and I2 are positioned side by side but out of engagement with each other and separated from the members 9 and H] by an interposed lamination 13 of insulating material and outside of the members II and I2 and separated therefrom by a. lamination I4 of insulating materlal is a coil supporting and clamping plate I5.
  • bolts 24 which extend through aligned holes in the assembled members and which may be threaded into the holes in the lower clamping plate 23 or which may have clamping nuts upon their lower ends.
  • the shanks of these bolts may, in the usual manner be surrounded by sleeves of insulating material such as hard rubber to insulate them from the field laminations, armature laminations and coil terminal members or the assembly structure disclosed in the Hickman- Lakatos application hereinbefore referred to may be employed thereby eliminating the insulating sleeves.
  • the end plates I and 23 are provided with out-turned ears 25 which serve as mounting brackets for the attachment of the relay structure to a suitable relay or apparatus rack and with a forwardly T-shaped portion 26, the arms of which serve as supports for the right and left operating coils R and L.
  • Each field lamination such as I is stamped from a sheet of suitable magnetic material into a U-shape most clearly disclosed in Fig. 2 and comprises one widened arm 21 which serves as a support therefor in the assembly and which is provided with two holes (not shown) through which the clamping bolts 24 extend, a narrow base portion 28 which, as later described embraces the outside of one of the operating coils and a second narrow arm 29 which serves as a pole-piece and extends through one of the operating coils.
  • the rear end of the arm 21 is provided with a rearwardy extending terminal lug (not shown).
  • the pole-piece arms 29 of the field laminations I and 2 extend through the operating coil L and the pole-piece arm 29 of the field lamination 3 extends through the operating coil R.
  • the pole-piece arm of each field lamination has a contact 30 Welded or otherwise secured to the pole face thereof facing the reed portion 6 of the armature lamination 5.
  • the armature lamination 5 is also stamped from a sheet of suitable magnetic material into the shape most clearly disclosed in Fig. 8 and comprises a widened base portion 3
  • the free end of the reed portion 6 extends freely between the inner faces of the coils L and R and between the pole-piece arms 29 of the upper field lamina tions I and 3 and the pole-piece arm 29 of the lower field lamination 2 and is provided on both faces thereof with contacts 34
  • Welded or other- I9 and 22 are rectangular in shape and are stamped from a sheet of suitable insulating material such as hard rubber or fiber and each is provided with four holes through which the clamping bolts 24 extend.
  • the coil terminal members 9, II, I2, I1, 20 and 2i are stamped out of sheet brass and each has a base portion serving as a support therefor in the assembly and provided with two holes through .which the clamping bolts 24 extend, with a forwardly extending arm and with a rearwardly extending terminal lug.
  • the terminal member 9 has an arm 36 extending forwardly and then upwardly at right angles and a terminal lug 31.
  • the coil terminal member I1 is similar to the member 9 except that the forwardly extending arm 36 is bent downwardly.
  • are also similar to the member 9 except that their arms 38 do not extend as far forwardly as the arm 36 of members 9 and I1 before they are bent at right angles as best disclosed in Fig.
  • the rectangular spacing members I0 and I8 may also be stamped from sheet brass of the same thickness as the brass from .which the coil terminal members are stamped and are also each provided with two holes through which clamping bolts 24 extend.
  • the right coil R is provided with an outer spoolhead 49 of insulating material upon which are mounted four coil terminal lugs M to 44, inclusive.
  • Each of these lugs is provided with a base member having two eyelet portions offset therefrom which extend through holes in the spoolhead Ml and are spun over on the reverse face thereof and With an arm portion which is bent around the arm portion of one of the coil terminal members.
  • the arm portion 45 of the terminal lug M is bent around the arm portion 38 of the member Ii and is then soldered thereto.
  • Four terminal lugs are shown secured in spoolhead 40 to connect with the terminals of the two windings of coil R.
  • the left coil L is provided with an outer spoolhead 46 to which two coil terminal lugs similar to the lugs 45 and 44 are secured for soldered connection with the arms 38 of the coil terminal members I2 and 2
  • Figs. I to 3, inclusive, just discussed are illustrative of the manner of assembly of the different elements of the relay to secure the contact arrangement disclosed diagrammatically in Fig. 4.
  • the fiux set up; thereby in the upper right field lamination 3 would attract the reed 6 out of engagement with the field lamination 2 thereby opening the normally closed circuit between the terminals a and j and engage the reed 6 with the field lamination 3 thereby closing a circuit between the terminals 1) and f.
  • a simple transfer is thereby effected.
  • the coil L is energized, the reed 6 is held thereby in engagement with the field lamination i and would continue to be so held following the subsequent deenergization of the coil R.
  • the usual relay and circuit arrangement for accomplishing this same circuit transfer and looking, as illustrated in Fig. 5, requires three relays L, R and X, the relay L having three contact springs, the relay R having two contact springs and the relay X having five contact springs or a total of three coils, ten contact springs and ten soldered connections to such springs, as contrasted with the two coils, no contact springs and the five soldered connections disclosed in the structure of Fig. 4.
  • the coil L surrounds only the pole-piece of a single field lamination l, the lower left field lamination 2 of Figs. 1 to 3, inclusive, being replaced by a spacer member similar to member i, the right field lamination 3 and the right spacer member 4 being interchanged so that the spacer 4 is positioned beside the field lamination l and the field lamination 3 is positioned beneath the reed portion 6 of the armature lamination 5.
  • the reed 6 is normally biased into contact with the pole-piece of the field lamination 3 thereby establishing the normally closed circuit between terminals (1 and f.
  • Fig. 7 The circuit of conventional relays for accomplishing the same function is illustrated in Fig. 7 as comprising three coils L, R and X, nine consuch springs as contrasted with two coils, no contact springs and three soldered connections disclosed in the structure of Fig. 6.
  • Fig. 10 illustrates a further relay assembly comprising a unit of three field laminations I, 2 and 3 and an armature reed 6 arranged in the manner disclosed in Figs. 1 to 4, inclusive, and a second similar unit comprising three field laminations I, 2' and 3' arranged reversely to the similar laminations of the other unit and an armature reed 8.
  • the left coil L surrounds the pole-pieces of the three field laminations l, 2 and 3' and the right coil R surrounds the polepieces of the field laminations l, 2 and 3.
  • the reed 6 is also provided near its forward end with a stud 41 of insulating material, ring-staked thereto and having its free end normally engaged against the upper face of the reed 5'. Normally the reeds 8 and 5 are both biased to engage with the pole-pieces of field laminations 2 and 2', respectively.
  • the spring combination disclosed therein may be expressed by the algebraic equations If coil L is first energized, no motion of the reed armatures 6 and 6' is produced because the flux generated by the coil L in the field lamination 2 will hold the reed t in engagement with the pole-piece thereof and the flux generated in the field lamination 3 will not be able to attract the reed 6' to its pole-piece because the reed will be prevented from moving by the stud 4?.
  • coil R If coil R is first energized, reed 8 will be at tracted into engagement with the field lamina tion 3 thereby moving the stud from the reed 6' but the reed 5 will not be attracted to the field lamination l since it is held magnetically against the field lamination 2' by the fiux generated therein by the coil R. If now, coil L is energized, the operated reed 6 becomes magnetically locked to the field lamination I, but the flux set up in the field lamination 3 will be unable to move reed 6' since it is held magnetically against the lamination 2 by the continued energization of coil R.
  • relays L and R correspond to the coils L and R of Fig. 10 and relays X1 and X2 correspond to the reeds 6 and 6' respectively.
  • relay R If relay R is first operated, with relay L unoperated, it causes the operation of relay X1 which looks over its upper contacts and the front con tacts of relay R independently of relay L.
  • relay L When thereafter relay L operates, it closes a new locking circuit for relay X1 and prepares an operating circuit for relay X2 which is established upon the subsequent release of relay R over the front contacts of relay L, the back contact of relay R and the inner contacts of relay X1.
  • Relay X2 upon operating looks over its own contacts and the front contacts of relay L and remains operated until relay L releases.
  • this circuit requires four relay coils, twelve contact springs and twelve soldered connections thereto whereas the relay structure of Fig. which performs the same functions requires but two coils, no contact springs and no soldered connections.
  • Fig. 12 illustrates the relay structure of Fig. 10 further expanded for the purpose of counting impulses.
  • the relay structure illustrated is ca pable of counting three impulses.
  • the right coil R is divided into two equal windings R and R wound difierentially with respect to each other.
  • the keys 48 and 50 are operated, key 43 closing an obvious circuit for operating relay 8B and key 56 closing a circuit extending from the negative terminal of battery over the contacts of key 50, through windings R, R and L in series to the other terminal of the battery 49.
  • Reed I5 is also held magnetically against the lower field lamination 61 linked with the coil R and through its stud 41 prevents the next reed 16 from being attracted upwardly toward the magnetized field lamination 68.
  • reed TI is held magnetically against the lower field lamination I0 linked with the coil R and through its stud 41 prevents the next reed 18 from being attracted upwardly toward the magnetized field lamination I I.
  • Reeds 16 and 18 are also held magnetically against the field laminations 58 and 6
  • a circuit is now established from ground over field lamination 59, reed 11 connected with reed 18 by conductor 85, field lamination 6
  • the lighting of lamp 86 indicates the counting of three received impulses.
  • a first and a second field lamination of magnetic material positioned in parallel layers, a first energ zing coil surrounding said laminations, a third field lamination of magnetic material positioned in the layer of said first lamination and out 01' conductive engagement therewith, a second energizing coil surrounding said latter lamination, a reed of magnetic material attractable into engagement with any one of said laminations, and laminations of insulating material interposed between said laminations and said reed, said reed being normally biased into engagement with said second lamination whereby it may be moved out of engagement therewith and into engagement with said other laminations only by the initial energization of said second coil and may be held in its attracted position by the continued energization of said second coil or the subsequent energization of said first coil.
  • a first set of field laminations of magnetic material the first and second laminations of which are positioned in parallel layers and the third lamination of which is positioned in the layer of the first lamination and out of conductive engagement therewith, a second set of field laminations having its laminations arranged reversely to those of said first set to form two groups of laminations, one comprising the first and second laminations oi.
  • the first set and the third lamination of the second set and the other comprising the first and second laminations of the second set and the third lamination of the first set, a reed of magnetic material associated with each set of laminations normally biased into engagement with the second lamina tion thereof and attractable into engagement with any lamination of the set, laminations of insulating material interposed between adjacent laminations and between adjacent laminations and reeds, energizing coils surrounding said groups of laminations respectively, and a stud of insulating material secured to the reed of said first set and engaged against the reed of said second set, whereby upon the sequential energization of said coils in a definite order and the release of the first operated coil, said reeds are operated sequentially.
  • a first set of field laminations of magnetic material the first and second laminations of which are positioned in parallel layers and the third lamination of which is positioned in the layer of the first and out of conductive.
  • a plurality of sets of field laminations of magnetic material the first and second laminations of each set being positioned in parallel layers and the third lamination of each set being positioned in the layer of said first lamination and out of conductive engagement therewith, adjacent sets of said laminations being assembled reversely to form two groups of laminations, one comprising the first and second laminations of the odd-numbered sets and the third laminations of the even-numbered sets, and the other group comprising the first and second laminations of the even-numbered sets and the third laminations of the odd-numbered sets, a reed of magnetic material associated with each set of laminations and attractable into engagement therewith, laminations of insulating material interposed between adjacent laminations and between adjacent laminations and reeds, energizing coils surrounding said groups of laminations,
  • a first plurality of sets of field laminations each comprising three laminations of magnetic material, the first and second of which are positioned in parallel layers and the third of which is positioned in the layer of the first and out of conductive engagement therewith
  • a second plurality of sets of field laminations alternated with the sets of said first plurality and each having its laminations arranged reversely to the laminations of said first sets to form two groups of laminations, one comprising the first and second laminations of the sets of said first plurality and the third laminations of the sets of said second plurality and the other comprising the first and second laminations of the sets of said second plurality and the third laminations of the sets of said first plurality
  • a reed of magnetic material associated with each set of laminations and normally biased into engagement with the second lamination thereof and attractable into engagement with any lamination of its set
  • laminations of insulating material interposed between adjacent laminations and between adjacent laminations and reeds
  • a first and a second pole-piece positioned in parallel planes, a first energizing coil surrounding said pole-pieces, a third pole-piece positioned in the plane of the first pole-piece and out of conductive engagement therewith, a second energizing coil surrounding said latter polepiece and an armature attractable into engagement with any one of said pole-pieces, said armature being normally biased into engagement with said second pole-piece whereby it may be moved out of engagement therewith and into engagement with said other pole-pieces only by the initial energization of said second coil and may be held in its attracted position by the continued energization of said second coil or by the subsequent ener 'gization of said first coil.
  • a relay a plurality of sets of pole-pieces, the first and second of each set being positioned in parallel planes and the third of each set being positioned in the plane of the first pole-piece, adjacent sets of said pole-pieces being assembled reversely to form two groups of pole-pieces.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
US389322A 1941-04-19 1941-04-19 Relay Expired - Lifetime US2305450A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL78933D NL78933C (xx) 1941-04-19
BE468901D BE468901A (xx) 1941-04-19
US389322A US2305450A (en) 1941-04-19 1941-04-19 Relay
GB7161/42A GB551433A (en) 1941-04-19 1942-05-27 Improvements in electromagnetic relays
FR943612D FR943612A (fr) 1941-04-19 1946-10-14 Relais électromagnétique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US389322A US2305450A (en) 1941-04-19 1941-04-19 Relay

Publications (1)

Publication Number Publication Date
US2305450A true US2305450A (en) 1942-12-15

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Application Number Title Priority Date Filing Date
US389322A Expired - Lifetime US2305450A (en) 1941-04-19 1941-04-19 Relay

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US (1) US2305450A (xx)
BE (1) BE468901A (xx)
FR (1) FR943612A (xx)
GB (1) GB551433A (xx)
NL (1) NL78933C (xx)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441001A (en) * 1943-07-02 1948-05-04 Kellogg Switchboard & Supply Electromagnetic counting device
US2452568A (en) * 1943-10-01 1948-11-02 Bell Telephone Labor Inc Switching device
US2456169A (en) * 1946-01-12 1948-12-14 Kellogg Switehboard And Supply Electromagnetic counting device
US2487015A (en) * 1946-09-26 1949-11-01 Kellogg Switchboard & Supply Electromagnetic counting device
US2538815A (en) * 1945-08-25 1951-01-23 Kellogg Switchboard & Supply Electromagnetic counting device
US2538817A (en) * 1946-11-20 1951-01-23 Kellogg Switchboard & Supply Electromagnetic counting device
US2538818A (en) * 1948-08-07 1951-01-23 Kellogg Switchboard & Supply Electromagnetic counting device
US2561730A (en) * 1946-03-20 1951-07-24 Bell Telephone Labor Inc Electrical impulse counting system
US2564432A (en) * 1947-07-03 1951-08-14 Bell Telephone Labor Inc Impulse counting relay
US2589806A (en) * 1947-07-03 1952-03-18 Bell Telephone Labor Inc Selective signaling system
US2610242A (en) * 1948-03-20 1952-09-09 Bell Telephone Labor Inc Impulse counting relay and system therefor
US2622143A (en) * 1947-10-03 1952-12-16 Hans P Boswau Electromagnetic counting device
US2672599A (en) * 1951-04-02 1954-03-16 Telephone Mfg Co Ltd Electric selecting device responsive to impulses
US3004703A (en) * 1953-07-31 1961-10-17 El Re Ma S A Per Io Sfruttamen Calculating machine with polarized relays
US3053953A (en) * 1959-08-19 1962-09-11 Siemens Ag Electromagnetic relay
US3078359A (en) * 1959-08-19 1963-02-19 Siemens Ag Relay set comprising two relays
CN109477373A (zh) * 2016-07-18 2019-03-15 伊士曼化工公司 井处理纤维输送系统

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441001A (en) * 1943-07-02 1948-05-04 Kellogg Switchboard & Supply Electromagnetic counting device
US2452568A (en) * 1943-10-01 1948-11-02 Bell Telephone Labor Inc Switching device
US2538815A (en) * 1945-08-25 1951-01-23 Kellogg Switchboard & Supply Electromagnetic counting device
US2456169A (en) * 1946-01-12 1948-12-14 Kellogg Switehboard And Supply Electromagnetic counting device
US2561730A (en) * 1946-03-20 1951-07-24 Bell Telephone Labor Inc Electrical impulse counting system
US2487015A (en) * 1946-09-26 1949-11-01 Kellogg Switchboard & Supply Electromagnetic counting device
US2538817A (en) * 1946-11-20 1951-01-23 Kellogg Switchboard & Supply Electromagnetic counting device
US2564432A (en) * 1947-07-03 1951-08-14 Bell Telephone Labor Inc Impulse counting relay
US2589806A (en) * 1947-07-03 1952-03-18 Bell Telephone Labor Inc Selective signaling system
US2622143A (en) * 1947-10-03 1952-12-16 Hans P Boswau Electromagnetic counting device
US2610242A (en) * 1948-03-20 1952-09-09 Bell Telephone Labor Inc Impulse counting relay and system therefor
US2538818A (en) * 1948-08-07 1951-01-23 Kellogg Switchboard & Supply Electromagnetic counting device
US2672599A (en) * 1951-04-02 1954-03-16 Telephone Mfg Co Ltd Electric selecting device responsive to impulses
US3004703A (en) * 1953-07-31 1961-10-17 El Re Ma S A Per Io Sfruttamen Calculating machine with polarized relays
US3053953A (en) * 1959-08-19 1962-09-11 Siemens Ag Electromagnetic relay
US3078359A (en) * 1959-08-19 1963-02-19 Siemens Ag Relay set comprising two relays
CN109477373A (zh) * 2016-07-18 2019-03-15 伊士曼化工公司 井处理纤维输送系统

Also Published As

Publication number Publication date
FR943612A (fr) 1949-03-14
BE468901A (xx)
GB551433A (en) 1943-02-22
NL78933C (xx)

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