What is the origin of the tone selection of the numbers on a telephone? - Straight Dope Message Board

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What is the origin of the tone selection of the numbers on a telephone?

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09-07-2003, 09:19 AM

the gullywumper the gullywumper is offline

the gullywumper is offline

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Join Date: Sep 2001

What is the origin of the tone selection of the numbers on a telephone?

Who came up the the sounds dialed numbers make on a telephone?
Are they universal tones?
Do range musically?
Do you think they'll ever change/disappear?

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