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| All Patents in class 409/251 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,203,798 | Jun. 11, 1940 | M. Romaine | Broaching Machine | broaching machines | |
| 2,205,277 | Jun. 18, 1940 | H. Horlacher, A.H. Hawley, M. Romaine | Broaching Machine | broaching machines | |
| 2,365,040 | Dec. 12, 1944 | A.L. Hamelberg, W.D. Averill | Broaching Machine | broaching machines | |