Like, is there some other technological advancement necessary to make it work?
Were electric speakers and microphones not a thing before telephones?
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The invention of the telephone *was* the invention of electronic microphones and speakers. Before Alexander Graham Bell, the problem of sending a voice through a wire in any way even across very short distances was unsolved. The solution to that problem turned out to be the invention of the electronic microphone, which was invented specifically for use in telephones.
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