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All Patents in class 451/376 | |||||
Number | Date | Patentee | Title | Type | |
523,897 | Jul. 31, 1894 | J.J. Kenyon | Drill Grinding Machine | drill grinders | |
1,323,452 | Dec. 02, 1919 | S.A. Cogsdill | Machine for Grinding Tools | tool grinders | |
2,099,724 | Nov. 23, 1937 | S.A. Cogsdill | Machine for Grinding Tools | tool grinders | |
2,207,804 | Jul. 16, 1940 | F.O. Hoagland | Drill Grinder | drill sharpening machines |