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| All Patents in class 91/15 | |||||
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| Number | Date | Patentee | Title | Type | |
| 144,731 | Nov. 18, 1873 | G.W. Bishop | Mechanisms for Reversing Engines | steam engine valve gear | |
| 313,729 | Mar. 10, 1885 | D.D. Hardy | Steam Engine Valve | steam engine valves | |
| 403,881 | May 21, 1889 | D.A. Frazer | Reversing Gear for Steam Engines | steam engine valve gear | |