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Wikipedia definition
1. Pulse dialingPulse dialing, dial pulse, or loop disconnect dialing, also called rotary or decadic dialling in the United Kingdom (because up to 10 pulses are sent), is pulsing in which a direct-current pulse train is produced by interrupting a steady signal according to a fixed or formatted code for each digit and at a standard pulse repetition rate. Dial pulsing originated with a rotary dial integrated into telephone instruments, for the purpose of signaling.
Read “Pulse dialing” on English Wikipedia
Read “ダイヤルパルス” on Japanese Wikipedia
Read “Pulse dialing” on DBpedia

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