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| All Patents in class 91/452 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,230,263 | Feb. 04, 1941 | E.C. Read | Governor | steam engine governors | |
| 2,969,808 | Jan. 31, 1961 | H. Horlacher | Two-Stage Valve | hydraulic apparatus | |
| 3,537,356 | Nov. 03, 1970 | E.I. Odell | Hydraulic Control System | machine tool controls | |