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| All Patents in class 418/82 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 642,785 | Feb. 06, 1900 | J. Craig | Reversible Rotary Engine | ||
| 2,056,910 | Oct. 06, 1936 | L.L. Schauer | Hydraulic motor unit | ||
| 2,377,299 | May 29, 1945 | A. Von Wangenheim | Rotary Pump | ||