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| All Patents in class 409/24 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,374,250 | Apr. 24, 1945 | W.F. Zimmermann | Worm Gear Hobbing Machine | gear hobbing machines | |
| 2,374,255 | Apr. 24, 1945 | G. Davenport | Control for Machine Tools | machine tool controls | |