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| All Patents in class 91/184 | |||||
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| Number | Date | Patentee | Title | Type | |
| 46,470 | Feb. 21, 1865 | W.C. Hicks | Improvement in steam-engines | steam engines | |
| 871,086 | Nov. 12, 1907 | W.O. Duntley, G.H. Hayes | Engine | pneumatic tools | |
| 1,045,630 | Nov. 26, 1912 | J. Stumpf | Unidirectional-flow steam-engine | steam engines | |