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| All Patents in class 137/637.3 | |||||
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| Number | Date | Patentee | Title | Type | |
| 30,485 | Oct. 23, 1860 | J.F. Letellier | Steam Valve | steam engine valves | |
| 473,486 | Apr. 26, 1892 | N.W. Twiss | Steam-engine valve | steam engine valve gear | |
| 2,972,357 | Feb. 21, 1961 | C.S. Gladoske, R.L. Ford | Hydraulic Rotary Selector Valve | hydraulic apparatus | |