U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 559
8 V * ^v ^ • NOBBiS PETERS CO. PHOTO-LITMO.. (No Model.) 17 Sheets—Sheet 16. G. E. HUNTER. MECHANISM FOR TESTING WATCH BALANCES AND HAIR SPRINGS. No. 490,202. Patented Jan. 17, 1893, … S *x
Clocks and watches
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