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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 444
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E. A. HAWTHORNE. ACOUSTIC APPARATUS. APPLICATION FILED IAN. 30, 1913. 1,198,844. Patented Sept. 19, 1916. 2 SHEETS-SHEET I. J^*&4. … * PCTERS CO.. PHOTO-UTHO.. WSHIh'GTON. D CPhonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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