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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 400
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R. A. BOSWELL. AMPLIFYING HOBN FOE TALKING MACHINES. APPLICATION FILED MAY 11, 1910. 999,954. Patented Aug. 8, 1911.Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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