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| All Patents in class 137/529 | |||||
| Number | Date | Patentee | Title | Type | |
| 716,864 | Dec. 30, 1902 | A.E. Cutler, F.A. Casey | Safety Valve | steam safety valves | |
| 1,229,459 | Jun. 12, 1917 | C.B. Jahnke, F.G. Hobart | Suction-valve holder | internal combustion engine valves | |