Inside Out Library · Explore
U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 473
(No Model.) 2 Sheets—Sheet 2. J. 0. BALL. TIME METER FOR ELECTRIC LIGHTING SYSTEMS. No. 488,107. Patented Dec. 13, 1892. jE^TQ-.a 17- … jrrztr. *4. *JClocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
More pictures from U.S. patents covering time keeping mechanisms
More like this
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-951-606.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-448-198.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-577-257.webp)
