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| All Patents in class 451/906 | |||||
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| Number | Date | Patentee | Title | Type | |
| 544,439 | Aug. 13, 1895 | A.B. Landis | Grinding-machine | grinders | |
| 709,178 | Sep. 16, 1902 | S.C. Schofield | Tool Holder and Guide for Grindstones | grinding machines | |
| 1,522,465 | Jan. 06, 1925 | G.C. Kimmel | Internal Grinding Machine | internal grinders | |
| 1,550,712 | Aug. 25, 1925 | J.A. Smith | Grinding machine | bench or pedestal grinders | |