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| All Patents in class 251/44 | |||||
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| Number | Date | Patentee | Title | Type | |
| 162,782 | May 04, 1875 | G. Westinghouse, Jr. | Improvement in governors for steam-engines | steam engine governors | |
| 787,422 | Apr. 18, 1905 | F.L. Wolfe | Whistle Valve | steam valves | |
| 1,234,882 | Jul. 31, 1917 | W.A. Doble | Speed Governor | water wheel governors | |
| 1,479,947 | Jan. 08, 1924 | C.H. Way | Automatic Toilet Flush | water valves | |