United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 150
7, (jJn ue It Xov B PCTCRB CO., PWOTO-llTHO., WASMfN :/. dLj-j& Co *.r-y^Uf»f^^ ^*W * fc>*-.^^^-v^-v United States Patent Office. THOMAS A. EDISON, OF LLEWELLYN PARK, NEW JERSEY, ASSIGNOR TOTHE EDISON PHONOGRAPH COMPANY, OF NEW JERSEY. PROCESS OF DUPLICATING PHONOGRAMS. SPECIFICATION forming…
Phonograph · Patents
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