U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 519
e detector, a cover for partly or wholly cov-5 ering the locking mechanism of the detector,and a pin so arranged with reference to saidcover that said cover cannot be moved to ex-pose the locking mechanism without press- ing said pin and thereby causing the mark-ing of said strip of paper or other… … 6WvUvc^<xi^ J?
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
