Edison's Telephone
»The
Motograph«, 1877
Loud-speaking (or musical) telephone, patented on July 30, 1877 by Thomas A. Edison, with carbon-button microphone and electromotograph (chalk) receiver with revolving drum of chalk and a small
crank.
Only 2 examples are known today worldwide.
Estimate: € 15,000/25,000
US$ 20,600/34,300
Reserve: € 7,500/US$ 10,280
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