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| All Patents in class 409/257 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,024,254 | Dec. 17, 1935 | M. Romaine, E.G. Roehm | Broaching Machine | broaching machines | |
| 2,025,070 | Dec. 24, 1935 | E.E. Nygren | Metal cutting machine | broaching machines | |
| 2,063,955 | Dec. 15, 1936 | B.P. Schiltz | Apparatus for machining metal parts | metalworking machines | |