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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You have the basic idea and instinct. It’s not fair to say that the telephone was invented suddenly in 1876 and before that we had nothing. The basic concepts and technologies were in play for decades previously, by which I mean the basic construction of microphones and speakers wired together.
It’s less that Alexander Graham Bell just up and invented the whole thing one afternoon, but rather that he combined all the various parts and technologies and made a really well functioning phone AND (and maybe more importantly) he *patented* it.
But yeah, the basic two-microphone two-speaker concept was in play at latest, 20 or 30 years prior to the “invention of the telephone”.
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