U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 181
aining it in raised or operative po-sition, a clock-hand having the spring-contactto engage those of the flaps which are in op- 60erative position, and a means for connectingsaid clock-hand with the other pole of the bat-tery, substantially as and for the purposeherein described. In testimony… … §^
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
