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| All Patents in class 417/299 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,215,071 | Feb. 06, 1917 | G.F. Steedman | Unloading-Valve for Compressors | |
| 3,389,660 | Jun. 25, 1968 | R.E. Gerrstrum, R.F. Van Allen | Pump with pressure relief | ||
| 4,715,789 | Dec. 29, 1987 | R.D. Liegel, J.G. Ballard | High speed hydraulic fluid venting valve in a hydraulic fluid pump | ||