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| All Patents in class 418/268 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 776,882 | Dec. 06, 1904 | B.F. Augustine | Rotary Engine | |
| 2,056,910 | Oct. 06, 1936 | L.L. Schauer | Hydraulic motor unit | ||
| 2,333,304 | Nov. 02, 1943 | C. Herfurth, A.H. Dall, H. Ernst | Surface Finishing Machinery | ||
| 2,377,299 | May 29, 1945 | A. Von Wangenheim | Rotary Pump | ||
| 2,435,279 | Feb. 03, 1948 | E.F. Hubacker | Pump, vane type | ||
| 2,497,247 | Feb. 14, 1950 | A. Von Wangenheim | Pump and Pressure Regulating Unit | ||
| 2,612,114 | Sep. 30, 1952 | W. Ernst | Vane Pump or Motor | ||