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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 110
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Patented Nov. II. 1902. No. 713,401, S. W. CLARK. SOUNDING BOARD. (Application filed Apr. 22, 1902. ) 2 Sheets— Sheet 2. INo Model.) … THE NORRta PETERS CO.. PHOTO-LITHO..Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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