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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 573
gtllwuty <& ($a%metis (Jt^^^-JjU 4<vc &*^*-*Aa, ***. (aM-9-w~l*P<. : NOHHIS fCTCRE. CO . fHOTO-l.l (No Model.) 10 Sheets—Sheet 3. G. E. HUNTER. METHOD OF TESTINO WATCH BALANCES AND HAIR SPRINGS. No. 490,203. Patented Jan. 17, 1893.Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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