U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 495
lectro magnet, an armature, and an impres-sion bar pivoted upon the armature and lat-erally movable thereon and vibrated verti-cally by it, in combination with type wheelssynchronous with a clock, the paper strip, the ink ribbon, and the vertically operated im-pression hammer. In witness whereof I… … FIG, I.
Clocks and watches
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