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| All Patents in class 417/308 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,460,875 | Jul. 03, 1923 | A. White | Rotary gear pump | ||
| 2,195,478 | Apr. 02, 1940 | J.Y. Blazek, V.R. Roy | Press | hydraulic metalworking presses | |
| 2,255,984 | Sep. 16, 1941 | E.M. Pfauser | Hydraulic Pump System | hydraulic pumps | |