Inside Out Library
[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 417
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&u rwi 1,138,755, H. W. HESS. ACOUSTIC INSTRUMENT. APPLICATION FILED DEC. 31, 1913. Patented May 11,1915. 2 SHEETS-SHEET 2. /c&o. £-Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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