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| All Patents in class 116/DIG.18 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,819,703 | Aug. 18, 1931 | W. Ernst | Valve | hydraulic motor controls | |
| 2,373,555 | Apr. 10, 1945 | B.E. Folke | Fluid Discharge Nozzle | lubricating accessories | |