3478791 Edison\'s phonomotor which used the energy generated by speech to drive a flywheel, 1878; (add.info.: Edison\'s phonomotor which used the energy generated by speech to drive a flywheel. Edison claimed the power could be used to drill a hole in a wooden wall, or other small tasks. Paris, 1878.); Universal History Archive/UIG; out of copyright.

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達志影像

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