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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 384
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F. J. PORTER. SOUND PRODUCER. APPLICATION FILED SEPT. 1, 1916. Patented Aug. 28,1917. 1,238,566, 3 SHEETS-SHEET 3. FigJZ @Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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