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[microsound] telephone numeric keypad tones?



i was wondering if there was any kind of history to these tones? why the
previous rotary system? when did the system come into place? does the
system have an actual name? an inventor? who set the pitches? why these
pitches? i remember some discussion of this here a while back, but don't
have any the thread saved... any info would be highly appreciated!

thanks

graham


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