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1861
Reis' telephone
event
1875
Alexander Graham Bell realizes that sound can be transmitted as a continuous el…
event
1877
Berliner develops improved telephone transmitter (microphone)
event
1879
Bell acquires Edison's carbon button amplifier microphone patents from Western …
event
1891
Bell long distance circuits map
1929
The U.S. has most of the world's telephones
event
1930
Anti-sidetone circuit developed
event
1930
AT&T World Radio Telephone Chart
1933
Map of Bell System Overseas Telephone Circuits
1944
Pie chart of Western Electric wartime production
event
1956
Transatlantic telephone cable (TAT-1)
event
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