U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 609
rved and extended at right angles tothe length of the arm to conform to the curva-ture of a clock and to partially embrace thesame, and the clock under which the spring 90arm passes and to which it is secured, sub-stantially as shown aird described. In testimony that I claim the foregoing Ihave… … Z&3.3
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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