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When did Alexander Graham Bell first conceive of the telephone?

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As early as 1865, Bell conceived the idea of transmitting speech by electric waves. In 1875, while he was experimenting with a multiple harmonic telegraph, the principle of transmission and reproduction came to him. By Mar. 10, 1876, his apparatus was so far developed that the first complete sentence transmitted, "Watson, come here; I want you," was distinctly heard by his assistant.

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Similar questions: What were the first words said over a telephone? When was the first telephone transmission completed? How did his work on the telegraph help Bell invent the telephone? [ Hide these questions ]

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