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| All Patents in class 137/493.2 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,835,979 | Dec. 08, 1931 | L.F. Nenninger, H. Ernst | Three-Pump Hydraulic System | ||
| 2,014,162 | Sep. 10, 1935 | H.F. MacMillin, E. Benedek | Hydraulic Press | ||