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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 577
/z. QSf^BB LCJl ijp D—<(/ … C£+^~-<£b* \l od^t^^Li, Asm fctts-i+Aj^vi^ THG NOHms PCTEfK CO . PMOTO-UTHO., WASHINGTON. I (No Model.) 10 Sheets—Sheet 6. G. E. HUNTER. METHOD OF TESTING WATCH BALANCES AND HAIR SPRINGS. No. 490,203. Patented Jan. 17, 1893.Clocks and watches
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