U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 23
~63 -61 JLJIZesi: IruJcnZoT: (No Model.) q -n TTJNDSTEDT 6 Sheets—Sheet 6. POSTAL DATE AND TIME STAMPING MACHINE. No. 472,951. Patented Apr. 12, 1892. J?ici.l2,
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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