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| All Patents in class 251/274 | |||||
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| Number | Date | Patentee | Title | Type | |
| 147,584 | Feb. 17, 1874 | B.F. Wilson | Improvement in stop-valves | water valves | |
| 511,661 | Dec. 26, 1893 | C. Stein | Gas and Oil Motor Engine | ||
| 1,772,406 | Aug. 05, 1930 | L.E. Whiton | Valve | steam valves | |