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| All Patents in class 418/206.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 79,781 | Jul. 07, 1868 | S.P. Ruggles | Improvement in Rotary Fluid-Elevators | rotary pumps | |
| 567,089 | Sep. 01, 1896 | J.B. Garber | Rotary pump | ||