[Graphophone patents]

United States. Patent Office · 1878 · Washington, D.C., Govt. Print. Off. · 268 pictures

A bound set of United States Patent Office specification drawings for graphophone and phonograph mechanisms, printed in Washington from the late 1870s onward for examiners, attorneys, and inventors. Line engravings show cylinders, mandrels, feed screws, diaphragms and gearing in plan, section and elevation, numbered part-by-part and signed by witnesses, supplying precise mechanical linework and figure labels.

Phonograph · Patents

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