Who filed a patent caveat for the telephone on the exact same day Alexander Graham Bell filed his patent?
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On February 14, 1876, Elisha Gray's lawyer filed a patent caveat for a telephone just hours after Bell's lawyer submitted his actual patent application. This coincidence sparked a massive legal battle. Gray's design used a liquid transmitter, a concept that Bell also successfully tested shortly after. Photo: Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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