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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 188
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G. H. UNDERHILL. SOUND BEPBODUCING OE SOUND EECOBDING MACHINE. APPLICATION FILED JUKE 11, 1904. 989,737. Patented Apr. 18, 1911. 5 SHEETS-SHEET 3. JFlztf 6 \ ^ … ME NORAIS PETgHS CO., WASHIIPhonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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