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| All Patents in class 137/471 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,138,278 | May 04, 1915 | J.H. Castle, W.G. Rogers | Pressure-controlled valve | pressure regulators | |
| 2,355,916 | Aug. 15, 1944 | E. Klafstad | Relief Valve | steam safety valves | |