U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 337
orted therein and having5 a series of characters, of which one or moreare visible from the front side of the calen-dar, means for moving the indicator, and aduplicate stationary set of characters behind the calendar to guide in moving the indicator,substantially as set forth. io In testimony…
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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