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| All Patents in class 91/477 | |||||
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| Number | Date | Patentee | Title | Type | |
| 46,470 | Feb. 21, 1865 | W.C. Hicks | Improvement in steam-engines | steam engines | |
| 1,893,825 | Jan. 10, 1933 | H. Ernst | Hydraulic Transformer | hydraulic apparatus | |
| 1,998,004 | Apr. 16, 1935 | H. Ernst | Differential Hydraulic Speed Gear | hydraulic apparatus | |
| 2,010,378 | Aug. 06, 1935 | B. Sassen | Hydraulic Power Unit | hydraulic apparatus | |
| 2,492,688 | Dec. 27, 1949 | A.H. Dall | Hydraulic Power Unit | hydraulic apparatus | |