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  1. Copilot Answer

    Telephone keypad - Wikipedia

    • A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s – this replaced rotary dialing, that had been developed for electromechanical t… See more

    Layout

    The layout of the digit keys is different from that commonly appearing on calculators and numeric keypads. This layout was … See more

    Key tones

    Pressing a single key of a traditional analog telephone keypad produces a telephony signaling event to the remote switching system. For touchtone service, the signal is a dual-tone multi-frequency signaling tone consisting … See more

    Letter mapping

    In the course of telephone history, dials as well as keypads have been associated with various mappings of letters and characters to numbers.
    The system used in Denmark was different from that u… See more

     
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