United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 663
two witnesses this 4th dayof February 1914. WILLIAM TUBES. Witnesses: Minnie M. Lindenau,Bess Mawhiney. Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 13 t METALLIC ACOUSTIC ■ DIAPHRAGM AKD THE MANUFACTURE THEREOF, #1,146,773-… … -V/////7777777T//////////////////h//////////////////////?/////n7>, ia.3
Phonograph · Patents
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