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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 500
Patented Mar. 6, 1900. No. 644,981. W. HART. GRAPHOPHONE REPRODUCER. (Application filed Nov. 22, 1897.) (No Model.) … \A7ifr)esses S PETtHS CO. PHOTO-LITHO. WfcSMmOTON. 0Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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