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| All Patents in class 91/273 | |||||
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| Number | Date | Patentee | Title | Type | |
| 8,242X | Jun. 14, 1834 | S. Barber | Expansive steam engine | steam engines | |
| 1,927,525 | Sep. 19, 1933 | H.G. Mueller | Reversing Valve Gear | steam engine valve gear | |
| 2,253,490 | Aug. 26, 1941 | H.F. Bakewell | Internal combustion engine | gas and gasoline engines | |
| 2,630,788 | Mar. 10, 1953 | H.G. Mueller | Valve Operating Mechanism for Controlling the Steam Events in Steam Engines | steam engine valve gear | |