U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 529
al, and re-spectively connected to the contact piece inthe lock and to the casing of the lock, saidcircuit wires being concealed within the door 25and electrically connected through the hingesof the door, substantially as described. In testimony whereof I affix my signature inpresence of two… … THE NORfllS PCTER8 CO . •MOTO-LITHO.. WASHINGTON. ) (No Model.) 17 Sheets—Sheet 2. G. E. HUNTER. MECHANISM FOR TESTING WATCH BALANCES AND HAIR SPRINGS. No. 490,202. Patented Jan. 17, 1893.
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-graphophonepaten20unit-1111-492.webp)
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