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| All Patents in class 451/290 | |||||
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| Number | Date | Patentee | Title | Type | |
| 626,436 | Jun. 06, 1899 | E. Mills | Grinding Machine | tool grinders | |
| 681,440 | Aug. 27, 1901 | A.R. Clizbe | Grinding Machine | sharpeners | |
| 2,269,556 | Jan. 13, 1942 | J.A. St. Clair | Method for grinding saws | making sawblades | |