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| All Patents in class 60/381 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,177,385 | Mar. 28, 1916 | C.M. Conradson | Hydraulic Variable Transmission | ||
| 1,746,419 | Feb. 11, 1930 | W. Ernst | Control Mechanism for Hydraulic Presses | ||
| 1,952,663 | Mar. 27, 1934 | W. Ernst | Control Mechanism for Pumps and Associated Press Circuits | ||
| 2,473,711 | Jun. 21, 1949 | J. Decker, B.A. Kearns | Rotary Pump and Motor Hydraulic Transmission System | ||