United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 322
7~- ^ … THE NORFnS PETEHS CO.. PHOTO-LITHO., WASHINGTON. O C. United States Patent Office< THOMAS A. EDISON, OF LLEWELLYN PARK, NEW JERSEY. PHONOGRAPH. SPECIFICATION forming part of Letters Patent No. 500,280, dated June 27,1893. Application filed November 21, 1890, Serial No, 372,224, (No modelJ To all…
Phonograph · Patents
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