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AT&T Archives: Switchboards, Old and New (Bonus Edition)
See more from the AT&T Archives at http://techchannel.att.com/archives Introduction by George Kupczak of the AT&T Archives and History Center Switchboards, Old and New traces the development of voice switching methods from the first system that utilized the wires of a burglar alarm unit in Boston in 1877, to the "latest type" of switching in ...
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