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| All Patents in class 417/253 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,769,898 | Jul. 01, 1930 | W.E. Mathews | Unloading System for Compressors | air compressors | |
| 4,715,789 | Dec. 29, 1987 | R.D. Liegel, J.G. Ballard | High speed hydraulic fluid venting valve in a hydraulic fluid pump | hydraulic pumps | |