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| All Patents in class 417/303 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,888,866 | Nov. 22, 1932 | P.S. Russel | Control Means | flow controls | |
| 2,100,997 | Nov. 30, 1937 | P.S. Russel | Pressure Control Device | pressure regulators | |
| 2,497,247 | Feb. 14, 1950 | A. Von Wangenheim | Pump and Pressure Regulating Unit | vane pumps | |