United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 709
composed ofcasein and beta-naphthol or its equivalents,substantially as described. 12. A sound-record tablet composed ofcasein, beta-naphthol or its equivalents and 50compounding materials, substantially as de-scribed. In testimony whereof I have signed myname to this specification in the presence… … WITNESSES: INVENTORS
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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