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| All Patents in class 451/42 | |||||
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| Number | Date | Patentee | Title | Type | |
| 441,570 | Nov. 25, 1890 | R.B. Leighton | Lens Grinding Machine | material grinding machines | |
| 1,282,037 | Oct. 22, 1918 | L.W. Bugbee | Grinding Machine | ||
| 2,269,556 | Jan. 13, 1942 | J.A. St. Clair | Method for grinding saws | making sawblades | |
| 2,352,146 | Jun. 20, 1944 | J. Desenberg | Grinding and Polishing Machine | polishing and buffing machinery | |