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