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| All Patents in class 137/539.5 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,614,580 | Oct. 21, 1952 | G.A. Cormier | Unloading Valve | hydraulic apparatus | |
| 3,235,098 | Feb. 15, 1966 | H.R. Emrick | Snap-in ball check valve | ||