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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 566
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M. KEEN. SOUND BEPBODUCING MACHINE. APPLIOATIOH FILED APE. 4, 1907. Patented Aug. 3, 1909. 929,859. 2 SHEETS-8HEET 1. n F/&J e ® … UCn* 1 OUNIN C9. P*C*&-l.rt'««U*'l»1 *U«M1T>Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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