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| All Patents in class 416/213A | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,294,315 | Dec. 27, 1966 | D.N. Stewart, R. Olson | Fan construction | ||
| 3,402,879 | Sep. 24, 1968 | J.W. Schroeter | Fan construction | ||