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  • Phonograph
    ...vibrations produced an up and down or hill-and-dale groove in the foil. [[Alexander Graham Bell]]'s [[Volta Laboratory and Bureau|Volta Laboratory]] made sever ...nberg.org/files/30112/30112-h/30112-h.htm Development of the Phonograph at Alexander Graham Bell's Volta Laboratory] {{webarchive|url=https://web.archive.org/we
    115 KB (17,286 words) - 16:32, 16 December 2018
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