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| All Patents in class 416/207 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,545,884 | Dec. 08, 1970 | J.W. Schroeter, D.N. Stewart | Adjustable fan construction | ||
| 4,386,886 | Jun. 07, 1983 | M.J. Neal | Adjustable vortex pump | ||