United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 578
Patented Sept. 17, 1901. No. 682,991. T. H. MacDONALD. PROCESS OF MAKING SOUND RECORDS. (Application filed Nov. 3, 1000.) (No Model.) … ^^y.ji. jp^^j. a ^CA /yJ^^ZZZiT
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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