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| All Patents in class 91/381 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,112,141 | Mar. 22, 1938 | H.C. Clay | Hydraulic Control for Variable Speed Transmissions | industrial machine speed and direction changing mechanisms | |
| 2,455,090 | Nov. 30, 1948 | W.T. Pritchard | Hydraulic marine steering gear for operating the rudders of ships | ||