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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 112
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W. H. PUMPHKEY. TALKING MACHINE, APPLICATION PILED MAE. 17, 1911. 1,087,256. Patented Feb. 17, 1914.Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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