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| All Patents in class 60/475 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,835,979 | Dec. 08, 1931 | H. Ernst, L.F. Nenninger | Three-Pump Hydraulic System | hydraulic apparatus | |
| 1,870,501 | Aug. 09, 1932 | W. Ernst | Plural Pressure Pump Control for Hydraulic Presses | hydraulic pump controls | |
| 2,006,311 | Jun. 25, 1935 | B. Sassen, H. Ernst | Leakage Compensator for Hydraulic Systems | hydraulic apparatus | |