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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 237
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PATENTED APR. 17, 1906. No. 817,868. C. A. PARSONS. SOUND REPRODUCER OR INTENSIFIER APPLICABLE TO PHONOGRAPHS, GRAMOPHONES, &c. APPLICATION FILED APR. 12, 1904. 3 SHEETS-SHEET !Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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