United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 307
7 s s &9-^, WITNESSES … INVENTOR Fredenc W Thomas /rT^yyyis?) ATTORNEYS METERS CO., PHOTO-LITHO . WASHINGTON. D. C. UNITED STATES PATENT OFFICE, FREDERIC W. THOMAS, OF NEW CITY, NEW YORK.DIAPHRAGM-SETTING FOR PHONOGRAPH-REPRODUCERS. 1,134,775. Specification of Letters Patent. Patented Apr. 6, 1915. Application filed July…
Phonograph · Patents
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