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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 432
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Patented Apr. 30, 1901. No. 672,979. W. T. GELTZ. 6RAPH0PH0NE, PHONOGRAPH, OR TALKIN6 MACHINE. (Application filed Oct. 3, 1800.) (No Model.) … TME NOHaiS PETERS CO, PHOTO-LITMO., WASMINOTOH, O C,Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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