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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 448
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ATTORNEYS. (No Model.) A. K. KELLER. MACHINE FOE OPERATING PHONOGRAPHS. No. 518,191. 4 Sheets—Sheet 4. Patented Apr. 10, 1894. … p=^ f>^Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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