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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 524
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A. RUCKGABER. SPEED REGULATOR FOR PHONOGRAPHS. APPLICATION FILED AUG. 31. 1915. Patented Oct 2, 1917. 1,241,887, 2 SHEETS-SHEET 2.Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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