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| All Patents in class 91/471 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 5,765 | Sep. 12, 1848 | F.E. Sickels | Method of Controlling Motive Power | ||
 | 6,162 | Mar. 10, 1849 | G.H. Corliss | Cut-Off and Working the Valves of Steam Engines | |
 | RE200 | May 13, 1851 | G.H. Corliss | Improvements in Cut-Off and Working the Valves of Steam Engines | |
 | 13,276 | Jul. 17, 1855 | A. Ferguson, J.B. Stott | Cross-Head Attachment for Working Steam-Engine Valves | |
| 359,865 | Mar. 22, 1887 | E. Hill | Valve Gear | ||
| 3,132,485 | May 12, 1964 | J.R. Watson | Hydraulic Motor Control | ||