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| All Patents in class 409/15 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,374,250 | Apr. 24, 1945 | W.F. Zimmermann | Worm Gear Hobbing Machine | ||
| 2,374,255 | Apr. 24, 1945 | G. Davenport | Control for Machine Tools | ||
| 2,374,258 | Apr. 24, 1945 | G. Davenport | Infeed Control for Worm Gear Hobbing Machines | ||
| 2,419,726 | Apr. 29, 1947 | H. Pelphrey | Automatic Worm Gear Hobbing Machine | ||
| 2,927,509 | Mar. 08, 1960 | A.D. Moncrieff | Loading Mechanism and Control Circuit Therefor | ||
| 3,146,676 | Sep. 01, 1964 | E.O. Carpenter | Machine Tool Control Mechanism | ||