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Science history: First two-way phone call across outdoor lines made by Alexander Graham Bell — Oct. 9, 1876
https://www.livescience.com/technology/communications/science-history-first-two-way-phone-call-across-outdoor-lines-made-by-alexander-graham-bell-oct-9-1876
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On Oct. 9, 1876, Alexander Graham Bell made a telephone call to his assistant a few miles away — the first demonstration of what would ultimately become a global telephone network.
