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| All Patents in class 137/271 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,497,247 | Feb. 14, 1950 | A. Von Wangenheim | Pump and Pressure Regulating Unit | ||
| 2,610,647 | Sep. 16, 1952 | G.F. Maglott | Pilot Operated Fluid Pressure Control Valve | ||