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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 252
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A. N. PIERMAN. SOUND MODIFIER. APPLICATION FILED SEPT. 13, 1906. 917,654. Patented Apr. 6, 1909. … ^ & -e. -tfy*-*^ ^?ftg/. hb Nomms ri 1 1 « . WASHtHTTOM. P tPhonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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