United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 617
a record having apair of reversed duplicate sound recordgrooves formed therein. In testimony whereof I have hereunto af- 100fixed my signature this 27th day of Octo-ber, 1916. CHARLES D. SMITH. Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,… … (~^^^sr ^-Pbi^c^C-^j -TTzL-e/z/ar
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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