United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 663
-V/////7777777T//////////////////h//////////////////////?/////n7>, ia.3 … WITNESSES: INVENTOR 1/_^<^cUt<? C/f\^fi/-OLesup tw^kYnr1^ COLUMBIA PLANOGDAPH CO., WASHINGTON. D. UNITED STATES PATENT OFFICE. EMANUEL AUFIERO, OF BROOKLYN, NEW YORK.METALLIC ACOUSTIC DIAPHRAGM AND THE MANUFACTURE THEREOF. 1,146,773. Specification of Letters Patent. Patented July 13,1915.…
Phonograph · Patents
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