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| All Patents of Type: hydraulic pump controls | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,861,116 | May 31, 1932 | W. Ernst | Control Mechanism for Pumps | hydraulic pump controls | |
| 1,870,501 | Aug. 09, 1932 | W. Ernst | Plural Pressure Pump Control for Hydraulic Presses | hydraulic pump controls | |
| 1,952,663 | Mar. 27, 1934 | W. Ernst | Control Mechanism for Pumps and Associated Press Circuits | hydraulic pump controls | |
| 1,978,016 | Oct. 23, 1934 | W. Ernst | Control Apparatus for Pumps | hydraulic pump controls | |