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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 145
X\ r 5G—N #: ,-7*- -oC 1 /i JC … —*E. SU G WITNESSES: « ^Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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