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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 344
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F. ERTUCK. MEANS FOR AUTOMATICALLY STOPPING GRAMOPHONES. APPLICATION FILED APR. 27, 1915. Patented Aug. 29, 1916. 1,196,672.Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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