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| A Photophone receiver and headset, one half of Bell and Tainter's optical telecommunication system of 1880 |
The Photophone, also known as a radiophone, was invented jointly by Alexander Graham Bell and his then-assistant Charles Sumner Tainter on February 19, 1880, at Bell's 1325 'L' Street laboratory in Washington, D.C. Both were later to become full associates in
