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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 766
J. F. OTT. PHONOGRAPH. APPLICATION FILED APE. 15, 1908. Patented Oct. 5, 1909. 936,272. fS>~Y … Mnewes: UOM* 9 uuu« CO »«j'C-i"-M«»»»<*»» MASmOTOo 0 CPhonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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