U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 539
p _g^% r \gjfc i —J \ <> ~~s i*n Ctt-^.ss, … zrz THC NORHIS PETERS CO . PHOTO-LlTHO., WASHINGTON, (No Model.) 17 Sheets—Sheet 7. G. E. HUNTER. MECHANISM FOR TESTING WATCH BALANCES AND HAIR SPRINGS. No. 490,202. Patented Jan. 17, 1893, <7? J? 3%£./4, V
Clocks and watches
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