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| All Patents in class 451/250 | |||||
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| Number | Date | Patentee | Title | Type | |
| 209,782 | Nov. 12, 1878 | J. Swan | Improvement in the Manufacture of Auger-Bits | making drills and augers | |
| 2,374,258 | Apr. 24, 1945 | G. Davenport | Infeed Control for Worm Gear Hobbing Machines | machine tool controls | |
| 2,981,038 | Apr. 25, 1961 | E.V. Flanders | Method of Grinding Helical Forms | thread grinders | |