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Touch-Tone dialing system
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Images
AT&T Touch-Tone telephone, 1968 Evolution of the Phone: A look at telephone technology through the decades.
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Touch-Tone dialing system: Media

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Images

AT&T Touch-Tone telephone, 1968
Courtesy of AT&T Bell Laboratories/AT&T Archive

Interactives

Evolution of the Phone
A look at telephone technology through the decades.
Encyclopædia Britannica, Inc.