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| All Patents in class 417/311 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,213,522 | Jan. 23, 1917 | C.W. Manzel | Air Pump | air pumps | |
| 1,460,875 | Jul. 03, 1923 | A. White | Rotary gear pump | ||
| 2,143,229 | Jan. 10, 1939 | P.S. Russel | Control Device | industrial control apparatus | |