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| All Patents in class 417/310 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 974,913 | Nov. 08, 1910 | J.W. von Pittler | Rotary compressor of the like | |
| 1,460,875 | Jul. 03, 1923 | A. White | Rotary gear pump | ||
| 1,804,133 | May 05, 1931 | W. Townsend | Unloading valve | ||
| 2,497,247 | Feb. 14, 1950 | A. Von Wangenheim | Pump and Pressure Regulating Unit | ||
| 2,921,437 | Jan. 19, 1960 | E.J. Svenson | Material Working Apparatus | ||
| 3,100,450 | Aug. 13, 1963 | E.J. Svenson | Hydraulically Actuated Machine Tool | ||