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| All Patents in class 91/246 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 93,125 | Jul. 27, 1869 | C.E. Rymes | Valve gear for rotary valves | |
| 257,994 | May 16, 1882 | D. Farquhar, R.W. Aitken | Valve Gear for Steam Engines | ||
 | 552,152 | Dec. 31, 1895 | J.B. Stanwood | Valve-gear for steam-engines | |
 | 1,244,664 | Oct. 30, 1917 | H.E. Warren | Fluid-operated lathe | |
| 1,425,631 | Aug. 15, 1922 | H.C. Clay | Valve Gear Mechanism | ||
| 2,303,639 | Dec. 01, 1942 | R.D. Wortendyke, C. Herfurth | Grinding Machine | ||