U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 587
dfuJJjeJ/: v. tffftoRM- A?. C$OJ,arih (0>/wfiiiZ(ft/ : NORRts PCTcns co, photo-litho., Washington, d, c. (No Model.) 10 Sheets—Sheet 10. G. E. HUNTER. METHOD OF TESTING WATCH BALANCES AND HAIR SPRINGS. No. 490,203. Patented Jan. 17, 1893, … : NORTHS PETEU»9 CO, PHOTO-LTHO., United States Patent Office. GEORGE E. HUNTER, OF ELGIN, ASSIGNOR TO THE ELGIN NATIONAL WATCH COMPANY, OF CHICAGO, ILLINOIS. METHOD OF TESTING WATCH-BALANCES AND HAIR-SPRINGS. SPECIFICATION forming part of Letters Patent No. 490,203, dated January 17, 1893.…
Clocks and watches
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