[Graphophone patents]

United States. Patent Office · 1878 · Washington, D.C., Govt. Print. Off. · 397 pictures

A bound set of United States Patent Office specifications for graphophones and talking machines, printed in Washington by the Government Printing Office from the late 1870s onward, filed for inventors, examiners and attorneys. The plates are line-engraved mechanical drawings: sectioned cases, tone arms over record discs, screws and bearings, all numbered and captioned in copperplate script, useful for diagram motifs and technical lettering.

Phonograph · Patents

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