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| All Patents in class 60/450 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,998,004 | Apr. 16, 1935 | H. Ernst | Differential Hydraulic Speed Gear | hydraulic apparatus | |
| 2,921,439 | Jan. 19, 1960 | F.G. Krafft | Pump Control | hydraulic apparatus | |
| 3,015,212 | Jan. 02, 1962 | W. Ernst, F.G. Krafft | Pump Control | hydraulic apparatus | |
| 3,429,123 | Feb. 25, 1969 | R.K. Burroughs | Speed control system | hydraulic apparatus | |