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| All Patents in class 451/186 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 256,440 | Apr. 11, 1882 | P. Medart | Machine for grinding pulleys | |
 | 938,494 | Nov. 02, 1909 | J.L. Kyle | Machine for sharpening lawn-mowers, skates, &c. | |
| 2,321,442 | Jun. 08, 1943 | J.C. Wilson | Collapsible antifriction nut | ||