| All Patents in class 91/250 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 422,769 | Mar. 04, 1890 | N.T. Greene | Liberating valve-gear for engines | steam engine valve gear |
| 424,605 | Apr. 01, 1890 | N.T. Greene | Exhaust-valve for engines | steam engine valves |
| 425,219 | Apr. 08, 1890 | N.T. Greene | Exhaust-valve-gear for engines | steam engine valve gear |
| 548,753 | Oct. 29, 1895 | N.T. Greene | Steam Engine | steam engines |
| 748,931 | Jan. 05, 1904 | G.F. Conner | Valve Gear for Engines | steam engine valve gear |
| 1,927,527 | Sep. 19, 1933 | H.G. Mueller | Valve Gear | steam engine valve gear |
