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| All Patents in class 451/376 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 523,897 | Jul. 31, 1894 | J.J. Kenyon | Drill Grinding Machine | ||
 | 641,107 | Jan. 09, 1900 | W.C. Heister | Machine for grinding drills | |
| 1,323,452 | Dec. 02, 1919 | S.A. Cogsdill | Machine for Grinding Tools | ||
| 2,099,724 | Nov. 23, 1937 | S.A. Cogsdill | Machine for Grinding Tools | ||
| 2,207,804 | Jul. 16, 1940 | F.O. Hoagland | Drill Grinder | ||