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| All Patents in class 417/46 | |||||
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| Number | Date | Patentee | Title | Type | |
| 417,770 | Dec. 24, 1889 | M.H. Collom | Speed Governor | steam pumps | |
| 1,341,696 | Jun. 01, 1920 | J.T. Wilkin | Proportional governor | pressure regulators | |
| 2,452,704 | Nov. 02, 1948 | G.A. Wahlmark | Hydraulic transmission and control | ||