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| All Patents in class 418/28 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,678,050 | Jul. 24, 1928 | E.J. Kearney | Adjustable Fluid Control Device | ||
| 2,431,122 | Nov. 18, 1947 | H.S. Jakobsen | Variable Volume Hydraulic Pump of the Axially Oscillating Vane Type | ||