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| All Patents in class 417/83 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,272,906 | Feb. 10, 1942 | L.E. Da Col | Centrifugal Pump | centrifugal pumps | |
| 2,941,474 | Jun. 21, 1960 | M.S. Hall | Self-Priming Pumping Apparatus | centrifugal pumps | |