A New General Purpose Relay for Telephone Switching Systems
A. C. Keller · Bell System Technical Journal · 1952
This paper describes a new general purpose electromagnetic relay for use in telephone switching systems. It is a wire spring relay known as the AF type relay and, with variations which provide slow release or marginal characteristics, it is known as the AG and AJ relay, respectively. Fig. 1 shows a typical AF type relay, Fig. 2 shows all of the parts of the relay and Fig. 3 is a drawing showing the relay assembly.