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| All Patents in class 251/65 | |||||
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| Number | Date | Patentee | Title | Type | |
| 319,260 | Jun. 02, 1885 | A.L. Ide | Governor for Steam and Fluid Engines | steam engine governors | |
| 2,387,858 | Oct. 30, 1945 | P.S. Russel | Liquid Level Controlling Means | liquid level controls | |
| 2,493,297 | Jan. 03, 1950 | W.S. Landon | Orifice Cleaning Means | pipe and orifice cleaners | |
| 2,494,395 | Jan. 10, 1950 | W.S. Landon | Magnetically Operated Safety Valve Closing Device | flow controls | |