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A wire spring relay is a type of relay, that has springs made from drawn wires of nickel silver, rather than cut from flat sheet metal as in the flat-spring relay. This class of relays provided manufacturing and operating advantages over previous designs. Wire spring relays entered mass production in the early 1950s. [1][2]
Wire spring relays were the most suitable relays for logic and computing functions.[citation needed] They were used extensively in markers, which were special purpose computers used to route calls in crossbar switch central offices.
Wire spring relays were primarily manufactured by the Western Electric Company for use in electromechanical telephone exchanges in the Bell System. The design was licensed for use around the world, and was commonplace in Japan.
Manufacturing of wire spring relays greatly declined in the late 20th century due to the introduction of digital electronic switching systems that used them in very small numbers.
A pair of wire spring relays in one frame, called a "split relay"
^Arthur C. Keller, A New General Purpose Relay for Telephone Switching Systems, Bell System Technical Journal, v.31(6), 1023 (November 1952)
^A.L. Quinlan, Automatic Contact Welding in Wire Spring Relay Manufacture, Bell System Technical Journal, v.33(4), 897 (July 1954)
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