Push-button telephone
Telephone which has buttons or keys for dialing
Push-button telephone
A push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones. Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in Pennsylvania. The technology at that time proved unreliable and it was not until after the invention of the transistor that push-button technology became practical. The Bell System selected Findlay, Ohio as the first city in the U.S. for marketing tests of touch-tone service and Ohio Bell began installing push-button telephones in Findlay homes starting on 1 November 1960. The next market was in Greensburg, Pennsylvania, starting on 1 February 1961. On 18 November 1963, after approximately three years of customer feedback, the Bell System officially introduced dual-tone multi-frequency (DTMF) technology...
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