U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 703
blocks, a bat- 45tery in the circuit electrically connected tothe clock frame, and wires leading from saidbattery to and through electrical devices andto the insulated electrodes, substantially asdescribed. In testimony whereof I have signed myname to this specification, in the presence oftwo… … sJt^StL&l.
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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