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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 366
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Em.3. (No Model.) No. 503,610. J. W. MACKINTOSH. PHONOGRAPH. 3 Sheets—Sheet 2. Patented Aug. 22, 1893. jv ,M- -Jl- … -^\Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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