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Rotary and Dual Tone Multi-FrequencyEssay Preview: Rotary and Dual Tone Multi-FrequencyReport this essayExplain the difference between:Rotary and Dual Tone Multi-frequency (DTMF)Phone key pads are actually a somewhat recent invention. Until the 1970s, the rotary dial was in widespread use. Numbers were dialed by turning and then releasing a disk on the front of the phone..
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