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| All Patents in class 91/171 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,410,603 | Nov. 05, 1946 | P.P. Dubosclard | Forming roll | sheet metal forming rolls | |
| 2,978,976 | Apr. 11, 1961 | M.W. Hazelton, R.E. Griesheimer, C.J. Ostendorf | Level control for press brakes and the like | sheet metal brakes | |
| 3,059,431 | Oct. 23, 1962 | F.E. Munschauer, Jr., G.H. Trautman, Jr., C.O. Jones, Jr. | Hydraulic power transmission systems for press brakes and like machines | punch presses | |