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| All Patents in class 451/148 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,612,830 | Jan. 04, 1927 | C.G. Olson | Grinding machine | gear hobbing machines | |
| 2,374,258 | Apr. 24, 1945 | G. Davenport | Infeed Control for Worm Gear Hobbing Machines | machine tool controls | |