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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 318
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C. F. HAMILTON. PHONOGRAPH. APPLICATION FILED DEC. 30, 1908. Patented May 4, 1909. 920,134. … thz Homrnig r-trrms co.. wash inarch-, a. c.Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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