Push-button telephone
The push-button telephone is a telephone that uses buttons or keys for dialing a telephone number to place a call to another telephone subscriber. 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. But the technology proved unreliable and it was not until long after the invention of the transistor when push-button technology matured. On 18 November 1963, after approximately three years of customer testing, the Bell System in the United States officially introduced dual-tone multi-frequency (DTMF) technology under its registered Touch-Tone mark. Over the next few decades touch-tone service
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Push-button telephone
The push-button telephone is a telephone that uses buttons or keys for dialing a telephone number to place a call to another telephone subscriber. 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. But the technology proved unreliable and it was not until long after the invention of the transistor when push-button technology matured. On 18 November 1963, after approximately three years of customer testing, the Bell System in the United States officially introduced dual-tone multi-frequency (DTMF) technology under its registered Touch-Tone mark. Over the next few decades touch-tone service
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The push-button telephone is a ...... or to activate other features.
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押しボタン式電話機(おしボタンしきでんわき)は、ダイヤル操作 ...... 機であっても回線種別がトーンダイヤル方式とは限らなくなった。
@ja
sound recording
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Wikipage page ID
26,046,623
Wikipage revision ID
743,173,079
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The push-button telephone is a ...... ew decades touch-tone service
@en
押しボタン式電話機(おしボタンしきでんわき)は、ダイヤル操作 ...... 機であっても回線種別がトーンダイヤル方式とは限らなくなった。
@ja
label
Push-button telephone
@en
押しボタン式電話機
@ja