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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 986
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L. MARKELS. UNIVERSAL TONE ARM. APPLICATION FILED APR. 16, 1915. Patented Dec. 19, 1916. 1,209,464. 2 SHEETS-SHEET 2. … WITNESSES: // 9 INVENTOR leonard Mar/c<?ls BY sfavwnnQe ATTORNEYPhonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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