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| All Patents in class 451/217 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,323,452 | Dec. 02, 1919 | S.A. Cogsdill | Machine for Grinding Tools | tool grinders | |
| 1,904,304 | Apr. 18, 1933 | R.E. Flanders | Method and Machine for Grinding Chasers | tool grinders | |
| 2,099,724 | Nov. 23, 1937 | S.A. Cogsdill | Machine for Grinding Tools | tool grinders | |
| 2,413,436 | Dec. 31, 1946 | O.W. Dawson | Grinding Machine | tool grinders | |