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| All Patents in class 91/259 | |||||
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| Number | Date | Patentee | Title | Type | |
| 451,720 | May 05, 1891 | H. Bolthoff | Steam-engine | steam engine valves | |
| 1,946,659 | Feb. 13, 1934 | L.R. Baker, A.D. Baker | Engine Valve Gear | steam engine valve gear | |
| 2,094,159 | Sep. 28, 1937 | H.G. Mueller | Valve Mechanism for Steam Engines | steam engine valve gear | |