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All Patents in class 72/21.5 | |||||
Number | Date | Patentee | Title | Type | |
3,115,858 | Dec. 31, 1963 | C.L. Mitchell | Hydraulic Press | hydraulic metalworking presses | |
4,653,300 | Mar. 31, 1987 | C.J. Crout, C.W. Frame, R.N. Harris | Adaptive, self-regulating forging hammer control system | drop hammers |