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| All Patents in class 251/122 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,983,165 | Dec. 04, 1934 | D.A. Cameron | Control Device | flow controls | |
| 2,275,624 | Mar. 10, 1942 | A.G. Hann | Control Device | flow controls | |
| 2,505,975 | May 02, 1950 | M.E. Landon, Administratrix, W.S. Landon, deceased (Estate of) | Reciprocating Travel Controlling Means | valves | |
| 4,078,383 | Mar. 14, 1978 | R.H. Nehrig | Hydraulic hand jack with needle release valve | automobile and truck jacks | |