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| All Patents of Type: hydraulic motor controls | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,819,703 | Aug. 18, 1931 | W. Ernst | Valve | hydraulic motor controls | |
| 1,927,583 | Sep. 19, 1933 | W. Ernst | Hydraulic Motor Control Means | hydraulic motor controls | |
| 1,937,192 | Nov. 28, 1933 | H.F. MacMillin, W. Ernst | Control Mechanism for Hydraulic Motors | hydraulic motor controls | |
| 1,940,668 | Dec. 26, 1933 | W. Ernst | Hydraulic Press Surge Control | hydraulic presses | |
| 2,225,952 | Dec. 24, 1940 | H.C. Clay | Control Mechanism | hydraulic motor controls | |