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| All Patents in class 91/270 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 67,659 | Aug. 13, 1867 | N.A. Otto, E. Langen | Gas Engine | ||
 | 93,125 | Jul. 27, 1869 | C.E. Rymes | Valve gear for rotary valves | |
| 359,865 | Mar. 22, 1887 | E. Hill | Valve Gear | ||
 | 417,653 | Dec. 17, 1889 | J.B. Stanwood | Steam-engine | |
 | 425,219 | Apr. 08, 1890 | N.T. Greene | Exhaust-valve-gear for engines | |
 | 533,290 | Jan. 29, 1895 | J.D. Gray | Direct-acting steam-engine | |
| 548,753 | Oct. 29, 1895 | N.T. Greene | Steam Engine | ||