Systems
Wire spring relays were also incorporated into the signaling channel units of carrier systems.
For the Stored Program Control exchanges of the early 1970s, many relays were made with steel cores that remained magnetized after current ceased to flow in the winding. This "magnetic latching" feature, different from the use of slugs to delay relay operation, was used in the arrays of reed relays that switched connection paths in the early models of Electronic Switching Systems. A miniature wire spring relay was also produced, starting in approximately 1974 as part of the 1A redesign of the 1ESS switch.
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.
Read more about this topic: Wire Spring Relay
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—Henry David Thoreau (1817–1862)