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the eleven digit dial was invented by a mortician named almon b. strowger. he was convinced that the local operators were diverting all the mortuary business calls to his competitors. so, he decided to do away with operators. he was granted a patent on march 10, 1891. and thus, the strowger automatic exchange (which later became the automatic electric company then finally gte) came into being.
in the earlier days of the history of the strowger automatic telephone dial system, both the vertical and rotary motions of all central office switches were directly controlled by dial impulses. it was not until the year 1899 that the rotary motion became automatic. the 10 digit automatic was made in both wall and desk versions.
