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| All Patents in class 417/309 | |||||
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| Number | Date | Patentee | Title | Type | |
| 774,503 | Nov. 08, 1904 | J.H. Norquist | Combined compression and exhaustion pump | pumps | |
| 1,621,495 | Mar. 22, 1927 | C.M. Conradson | Rotary Pump | rotary pumps | |