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| All Patents in class 91/250 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 422,769 | Mar. 04, 1890 | N.T. Greene | Liberating valve-gear for engines | |
 | 424,605 | Apr. 01, 1890 | N.T. Greene | Exhaust-valve for engines | |
 | 425,219 | Apr. 08, 1890 | N.T. Greene | Exhaust-valve-gear for engines | |
| 548,753 | Oct. 29, 1895 | N.T. Greene | Steam Engine | ||
| 748,931 | Jan. 05, 1904 | G.F. Conner | Valve Gear for Engines | ||
| 1,927,527 | Sep. 19, 1933 | H.G. Mueller | Valve Gear | ||