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| All Patents in class 91/257 | |||||
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| Number | Date | Patentee | Title | Type | |
| 23,737 | Apr. 19, 1859 | D.A. Woodbury | Variable cut-off gear for steam-engines | steam engines | |
| 69,232 | Sep. 24, 1867 | J. McConnell | Rotary Steam Valve | steam engine valves | |
| 449,504 | Mar. 31, 1891 | J.E. Waterous | Valve for steam-engines | steam engine valve gear | |