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The evolution of telephones

by CBS News  |  February 10, 2012 8:33am PST  |  Image 1 of 40

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1876-LiquidTransmitter_540x405.jpg

Liquid transmitter - 1876

Alexander Graham Bell spoke the words "Mr. Watson, come here. I want you," into a phone similar to this one.

Author: Chenda Ngak

Credit: Cyber Telephone Museum/Ron Christianson

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