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| All Patents in class 251/120 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,459,809 | Jun. 26, 1923 | A. Von Wangenheim | Valve | valves | |
| 2,275,624 | Mar. 10, 1942 | A.G. Hann | Control Device | flow controls | |
| 2,277,006 | Mar. 17, 1942 | P.S. Russel | Control Device | flow controls | |
| 2,706,489 | Apr. 19, 1955 | T.V. Pedersen | Pressure Relief Valve | valves | |
| 3,939,925 | Feb. 24, 1976 | I.R. Danielson | Throttle valve construction for percussion tool | ||