United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 231
y^dt^A (^.%pCftUur^^ … Inventor: ^ Atty .NWtW a C«A..>. CO P«OT0.UTI.(»BAPt(OiS *«Hl«r(W 0 i UNITED STATES PATENT OFFICE. FREDERICK W. MATTHEWS, OF NEW YORK, N. Y.PROCESS OF DUPLICATING PHONOGRAMS. 951,483. Specification of Letters Patent. Patented Mar. 8, 1910. Application filed August 16, 1909. Serial No. 513,193.…
Phonograph · Patents
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