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Rotary Dial

The rotary dial is a device mounted on or in a telephone or switchboard that is designed to send electrical pulses, known as pulse dialing, corresponding to the number dialed. the early form of the rotary dial used lugs on a finger plate instead of holes. almon brown strowger filed the first patent for a rotary dial, u.s. patent #486,909, on december 21, 1891, that was later issued to him on november 29, 1892.