U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 121
ted thereto, a second lever con-nected to one end of the first and having its 30power end outside a casing inclosing the partsabove a rigid stop, and a register-plate pro-vided with flanges at its ends to engage saidstop and lever, substantially as described. In witness whereof I have hereunto…
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from La lumière et les coleurs au point de vue physiologique [electronic resource] (1888)](https://img.insideoutlibrary.com/img/200/ia-b21285615-74-0.webp)
