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| All Patents in class 251/310 | |||||
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| Number | Date | Patentee | Title | Type | |
| 139,096 | May 20, 1873 | E. Ware | Steam Engine Governor-Valves | steam engine governors | |
| 596,639 | Jan. 04, 1898 | W.W. Tucker | Oil-cup | oil cups | |
| 2,972,357 | Feb. 21, 1961 | C.S. Gladoske, R.L. Ford | Hydraulic Rotary Selector Valve | hydraulic apparatus | |