Inside Out Library
[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 305
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*H0«« » C«AH*M CO (^HCTTO l.irMOG^*P*<£PS. »V«HtK(WOK O. C !■:•:]] 5; V. E. DURSO. SOUND AMPLIFIER FOB PHONOGBAPHS. APPLIOATION FILED OOT. 6, 1909. Patented Apr. 26,1910. a SEBETB-8HEET 3. … WITNESSES:Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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