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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 354
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(No Model.) 3 Sheets—Sheet 2. C. A. RANDALL. APPARATUS FOR RECORDING AND REPRODUCING ARTICULATE SPEECH. No. 502,383. Patented.Aug. 1, 1893.Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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