U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 511
0rupted by a recess or opening, and contactsprings co-operating with said contact piece,whereby the contact arm is thrown out of cir-cuit when said recess reaches a given point;as set forth. 45 In testi uiony whereof I have have signed myname to this specification, in the presence oftwo subscribing… … ^^ s*Z ^t& 4- <f=^=^ WITNESSES : -&&/
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-576-248.webp)
