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| All Patents in class 91/248 | |||||
| Picture | Number | Date | Patentee | Title | |
| 1,125,204 | Jan. 19, 1915 | R.C. Stevens | Engine Valve Gear | ||
![]() | 5,715,724 | Feb. 10, 1998 | C.J. Crout, R.N. Harris | Adaptive, self-regulating forging hammer control system | |