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| All Patents in class 91/252 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 7,350 | May 07, 1850 | C. Richardson | Steam Engine Valve Gear | ||
 | 65,470 | Jun. 04, 1867 | P. Bloomsburg, Jr., J. Molyneux | Rotary valve for steam engines | |
 | 262,476 | Aug. 08, 1882 | E. Reynolds | Valve Gear for Compound Engines | |
 | 318,003 | May 19, 1885 | J.H. Eickershoff, J.F. Krieger | Compound Steam Engine | |
 | 552,152 | Dec. 31, 1895 | J.B. Stanwood | Valve-gear for steam-engines | |
| 1,125,204 | Jan. 19, 1915 | R.C. Stevens | Engine Valve Gear | ||