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| All Patents in class 417/428 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,411,025 | Mar. 28, 1922 | C.B. Jahnke, F.G. Hobart | Oil Engine Feeding Device | ||
| 1,460,875 | Jul. 03, 1923 | A. White | Rotary gear pump | ||
| 2,185,338 | Jan. 02, 1940 | E.C. Hassler | Fluid handling apparatus | ||
 | 2,255,984 | Sep. 16, 1941 | E.M. Pfauser | Hydraulic Pump System | |