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| All Patents in class 409/244 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,044,497 | Jun. 16, 1936 | B.P. Schiltz | Method of Machining Metallic Workpieces | ||
| 2,088,119 | Jul. 27, 1937 | B.P. Schiltz | Method of machining metallic workpieces | metalworking machines | |
| 2,255,221 | Sep. 09, 1941 | F.J. Lapointe | Method and means for surface broaching | broaching machines | |
| 2,553,966 | May 22, 1951 | W.L. Groene | Method of broaching rotating work | broaching machines | |