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This page was last edited on 26 June 2011, at 10:15 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may ...
Touch-tone. The international standard for telephone signaling utilizes dual-tone multi-frequency (DTMF) signaling, more commonly known as touch-tone dialing. It replaced the older and slower pulse dial system.
Ericofon. The Ericofon is a one-piece plastic telephone created by the Ericsson Company of Sweden and marketed through the second half of the 20th century. It was the first commercially marketed telephone to incorporate the dial and handset into a single unit. Because of its styling and its influence on future telephone design, the Ericofon is ...
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DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in 1963. DTMF is standardized as ITU-T Recommendation Q.23. It is also known in the UK as MF4.
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In 1963, the Bell System introduced touchtone dialing, and Western Electric began production of a touch-tone model, with 10 numerical keys, lacking today's * and # keys. The internals of the Princess were reduced in size the same year, allowing a small, quiet bell ringer to be placed to the left of the touch-tone dial.
Specifically, such telephone sets were the types 565 (up to 5 lines), 630 (17 lines), 631 (29 lines), 830 (9 lines), and 831 (19 lines). Telephone sets could be either rotary dial models, or be equipped with Touch-Tone keypads. A power supply was either mounted within the panel or separately nearby.
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