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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 1151
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#6 *S F/g.2. 3 j3 /!4 … 4^ Fig. 4. J-3 WITNESSESPhonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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