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| All Patents in class 251/31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,286,880 | Jun. 16, 1942 | W.A. Traut | Hydraulic Control System | ||
| 2,618,244 | Nov. 18, 1952 | E.G. Roehm | Pilot Valve Controlled Tracer Valve | hydraulic apparatus | |
| 2,635,847 | Apr. 21, 1953 | F.H. Rued | Turbine Jet Controller | nozzle controllers | |