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| All Patents in class 415/208.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 332,249 | Dec. 15, 1885 | O.E. North, M.F. Graham | Motor | air motors and turbines | |
| 509,863 | Dec. 05, 1893 | F.M. Bookwalter | Water Wheel | water wheels | |
| 2,311,896 | Feb. 23, 1943 | A.A. Criqul | Fan | ||