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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 568
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J. HOFFAY. SOUND BOX. APPLICATION FILED MAR. 13, 1914. Patented Oct. 24, 1916. 1,202,520. 4 SHEETS-SHEET 3. … H|:7. //yi/^/vro/f M//r/vfSSFS ^5 ^ «-"%■=Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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