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| All Patents in class 418/190 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,460,875 | Jul. 03, 1923 | A. White | Rotary gear pump | ||
| 1,633,793 | Jun. 28, 1927 | F. Porst | Gear pump | ||
| 1,976,227 | Oct. 09, 1934 | C.J. Howard | Gear Pump | rotary pumps | |