[Graphophone patents]

United States. Patent Office · 1878 · Washington, D.C., Govt. Print. Off. · 450 pictures

A bound set of United States Patent Office specification drawings for graphophone and phonograph mechanisms, printed in Washington by the Government Printing Office from 1878 onward for patent examiners, attorneys and the trade. The plates are line engravings of cylinders, mandrels, governors, reproducer arms and gear trains, with hatched sections, lettered part keys, figure captions and inventors' signatures usable as technical ornament.

Phonograph · Patents

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