United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 660
F. W. THOMAS. DIAPHRAGM FOE SOUND BEPBODOCEES. APPLICATION PILED MAE. 11, 1913. Patented Nov. 3, 1914. 1,116,165. Ja Imi.1, … 1 1 %t C M'- feS^ INVENTOR WITNESSES 7rederic W. Thomas wdu/zx/id y/w^ix. BY ATTORNEYS *E NORWS RETERS CO.. PHOTO-UTHO.. WASHINGTON. O. C.
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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