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| All Patents in class 251/47 | |||||
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| Number | Date | Patentee | Title | Type | |
| 192,273 | Jun. 19, 1877 | N.E. Nash | Steam-Engine Governor | steam engine governors | |
| 2,620,823 | Dec. 09, 1952 | R.D. Wortendyke, R.R. Adams | Tracer Valve Mechanism with Dashpot | hydraulic apparatus | |
| 2,635,847 | Apr. 21, 1953 | F.H. Rued | Turbine Jet Controller | nozzle controllers | |