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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 290
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G. H. UNDERBILL. SOUND REPRODUCING OR SOUND RECORDING MACHINE APPLICATION FILED MAT 6, 1905 Patented June 13,1911. 995,390. 6 SHEETS-SHEET 5, … GecjtyreJf lln&ejrh ill G2-*-*-*-*-*^ tJllllfSPhonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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