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| All Patents in class 91/400 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,537,356 | Nov. 03, 1970 | E.I. Odell | Hydraulic Control System | machine tool controls | |
| 3,913,450 | Oct. 21, 1975 | R. MacGregor | Hydraulic control system for press brakes or the like | sheet metal brakes | |