[Graphophone patents]

United States. Patent Office · 1878 · Washington, D.C., Govt. Print. Off. · 316 pictures

A bound run of United States Patent Office specifications for graphophone and phonograph mechanisms, printed by the Government Printing Office in Washington and issued from 1878 onward for examiners, inventors, and attorneys. The plates are numbered line drawings in ink—sectioned sound boxes, discs and cylinders, screws, springs and levers—usable as clean technical diagram vocabulary, hatching patterns, and hand-lettered figure labels.

Phonograph · Patents

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