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| All Patents in class 72/21.3 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,465,733 | Aug. 21, 1923 | J.H. Holmgreen | Bending Machine | sheet metal bending machines | |
| 3,485,071 | Dec. 23, 1969 | C.O. Jones, Jr. | Multiple stroke depth selector for hydraulic press brakes | stamping presses | |