United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 307
specification in the presence oftwo subscribing witnesses. FREDERIC W. THOMAS.Witnesses: Chatten Bradway,George H. Emsme. Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. DIAPHRAGM SETTING FOR PHOIOGRAPH REPRODUCERS, #…
Phonograph · Patents
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