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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 570
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No. 748,969. PATENTED JAN. 5, 1904. C. MELVILLE. MEGAPHONE. APPLICATION FILED JULY 24, 1903. VO IfODEL. … INVENTOR WITNESSES: BY. /^^<S<>^!A*Z--»— ^ ATTORNEYS THE NORRlS PETERS CO. rH6TO-LlTHO.. WASMINOT&N, IPhonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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