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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 738
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No. 794,592. PATENTED JULY 11, 1905. E. N. DICKERSON. RECORD CYLINDER FOR PHONOGRAPHS. APPLICATION PILED MAE. 22, 1887. … 2^7^T WITNESSES: INVENTORPhonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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