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| All Patents in class 72/323 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,631,386 | Jun. 07, 1927 | J.O. Groff, W. Seymour, A. Schaaf | Metal Bending Machine | metal bending machines | |
| 2,335,480 | Nov. 30, 1943 | O. Bergstrom | Bending machine | ||