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| All Patents in class 451/199 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 390,931 | Oct. 09, 1888 | B.D. Whitney | Sharpening-machine | ||
 | 1,440,386 | Jan. 02, 1923 | C.L. Hawes | Polishing and Grinding Machine | |
| 1,611,136 | Dec. 14, 1926 | F.C. Sanford | Centerless Grinding Machine for Tapering Drills and the Like | ||