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AT&T Archives: Electrical Transmission of Speech

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Published on May 2, 2011

See more from the AT&T Archives at http://techchannel.att.com/archives

One of the earliest films in the AT&T archives, this is a basic explanation of how, through telephony, speech becomes electricity and then becomes speech again. In simple animation, circuits are "built" and "tested" onscreen. The year is unknown, but it is probably from the early 1920s.

Silent.

Footage courtesy of AT&T Archives and History Center, Warren, NJ

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