United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 745
of said valve to effect a modifica-tion of sounds transmitted through said con-duit. In testimony whereof I have hereunto set 100my name this 25 day of July, 1917. THOMAS KRAEMER. Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.… … A/lTNESSES
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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