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| All Patents in class 251/175 | |||||
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| Number | Date | Patentee | Title | Type | |
| 15,400 | Jul. 22, 1856 | H.R. Worthington | Relieving steam slide-valves from pressure | steam engine valve gear | |
| 204,018 | May 21, 1878 | H.F. Frisbie | Puppet-Valve | steam engine valves | |
| 248,728 | Oct. 25, 1881 | H.F. Frisbie | Puppet Valve | steam engine valves | |
| 1,942,589 | Jan. 09, 1934 | G.A. Biggs | Hydraulic Turbine | turbine water wheels | |
| 2,972,357 | Feb. 21, 1961 | C.S. Gladoske, R.L. Ford | Hydraulic Rotary Selector Valve | hydraulic apparatus | |