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| All Patents in class 138/31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 114,683 | May 09, 1871 | B. Holly | Pressure Regulator | water regulators | |
| 383,225 | May 22, 1888 | A.G. Hohenstein | Pressure-regulator | steam valves | |