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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 469
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No. 831,606. PATENTED SEPT, 25, 1906.T. A. EDISON.SOUND RECORDING APPARATUS. APPLICATION FILED HOV. 8. 1901. 4 8HEET8-8HEET 1. Jfy.S … .Ji4.£<Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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