Inside Out Library
[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 924
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T. A. EDISON. PHONOGRAPHIC RECORDING AND REPRODUCING MACHINE. APPLICATION PILED MAE. 16, 1907. Patented Nov. 16, 1909. 939,992. -$PJ … #. «<w •zr./4~—~ ' Ob. \^/pcPhonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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