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Telephone

Many people consider Alexander Graham Bell’s 1876 telephone patent to have been the most valuable ever issued by the U. S. Patent Office. In his recent book, The Telephone Gambit: Chasing Alexander Graham Bell’s Secret, author Seth Shulman claims that Bell “stole the key idea behind the invention of the telephone,” having copied the idea for a liquid transmitter from a patent caveat filed by rival Elisha Gray, and that Gray’s idea unlocked the secrets of the telephone for Bell.

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