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| All Patents in class 418/269 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 597,585 | Jan. 18, 1898 | H.J. McLoed | Rotary Engine | ||
| 2,460,047 | Jan. 25, 1949 | A. Von Wangenheim | Vane Pump and Pressure Control Means | ||
| 3,011,449 | Dec. 05, 1961 | W. Ernst | Vaned Hydraulic Unit | ||