U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 351
nsumed in the complete rev- 95olution of the cylinder, a marking device con-trolled by said cylinder and arranged to re-cord upon a dial placed upon a clock-move-ment the relative location to each other ofthe said circuit-breakers as they interrupt the 100passage of the current from the brushes to… … Fzcs 2.
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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