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| All Patents in class 91/13 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 8,979X | Jul. 21, 1835 | A.M. Eastwick | Slide valves for steam engines | ||
 | 424,183 | Mar. 25, 1890 | F.A. Shoemaker, J.W. Dennis | Reversing-valve for steam-engines | |
| 714,977 | Dec. 02, 1902 | C. Vogel | Steam Engine | ||
 | 912,893 | Feb. 16, 1909 | A. Runnion | Reversing Gear for Engines | |