United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 196
V. E. D'URSO. SODND AMPLIFIER FOR PHONOGRAPHS. APPLICATION FILED OCT. 24, 1911. Reissued Mar. 5, 1912. 13,378. 3 SHEETS-SHEET 3. … ^X / ^ INVENTOR WITNESSES 9r: ^^^. ATTORNEY COLUMBIA PLANOGBAPH CO.. WASHINOTON. D. C.
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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