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- Q7261720 subject Q7134696.
- Q7261720 subject Q8834661.
- Q7261720 abstract "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 replaced traditional pulse dialing technology and it eventually became a world-wide standard for telecommunication signaling.Although DTMF was the driving technology implemented in push-button telephones, some telephone manufacturers used push-button keypads to generate pulse dial signaling. Before the introduction of touch-tone telephone sets, the Bell System sometimes used the term push-button telephone to refer to key system telephones, which were rotary dial telephones that also had a set of push-buttons to select one of multiple telephone circuits, or to activate other features.".
- Q7261720 thumbnail Радиотелефон.jpg?width=300.
- Q7261720 wikiPageWikiLink Q103903.
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- Q7261720 wikiPageWikiLink Q7134696.
- Q7261720 wikiPageWikiLink Q734974.
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- Q7261720 description "How DTMF dialing sounds.".
- Q7261720 filename "DTMF dialing.ogg".
- Q7261720 title "DTMF dialing".
- Q7261720 type Thing.
- Q7261720 comment "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.".
- Q7261720 label "Push-button telephone".
- Q7261720 depiction Радиотелефон.jpg.