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| All Patents in class 451/402 | |||||
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| Number | Date | Patentee | Title | Type | |
| 39,317 | Jul. 21, 1863 | J. Dodge | Improvement in machines for grinding and polishing cutlery | tool making machines | |
| 810,426 | Jan. 23, 1906 | R.L. Morgan, J.N. Heald | Grinding-machine | surface grinders | |
| 1,096,188 | May 12, 1914 | C.H. Norton | Apparatus for grinding rolls | grinders | |
| 2,138,264 | Nov. 29, 1938 | A.L. Warner | Work holder for mower sections | ||