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| All Patents in class 417/225 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,296,647 | Dec. 15, 1936 | J.H. McCormick | Hydraulic Pressure Booster | hydraulic pump controls | |
| 2,131,611 | Sep. 27, 1938 | G.A. Biggs | Turbine Pump | turbine water wheels | |