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| All Patents in class 137/466 | |||||
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| Number | Date | Patentee | Title | Type | |
| 383,226 | May 22, 1888 | A.G. Hohenstein | Automatic pressure-regulator and safety-valve | steam valves | |
| 1,133,601 | Mar. 30, 1915 | R. Wood | Ejecting Device | feedwater apparatus | |