U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 175
In time-setting devices for watches andclocks, the combination of a movable or re-volving crystal having an opening therein,the hand-post extending through said open-ing, and a movable key or slide for engagingand disengaging said hand-post, substantiallyas described. In testimony whereof I affix…
Clocks and watches
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