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| All Patents in class 409/250 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,088,119 | Jul. 27, 1937 | B.P. Schiltz | Method of machining metallic workpieces | metalworking machines | |
| 2,225,731 | Dec. 24, 1940 | W.D. Averill | Broaching Machine | broaching machines | |
| 2,343,420 | Mar. 07, 1944 | J.W. Podesta | Broaching machine | broaching machines | |