| All Patents in class 251/251 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 8,849X | May 29, 1835 | J. Kirkpatrick | Boiler valves and cam of the steam engine | stationary boilers |
| 12,507 | Mar. 13, 1855 | N.T. Greene | Cut-off valve for steam-engines | steam engine valve gear |
| 77,387 | Apr. 28, 1868 | W.H. Laubach | Valve for Gas Engine | internal combustion engine valves |
| 426,510 | Apr. 29, 1890 | A.C. Monfort | Champagne or Mineral Water Tap | champagne and soda tools |
| 1,990,052 | Feb. 05, 1935 | A.M. Sosa | Fluid actuated drill feed | radial drill presses |
| 2,496,040 | Jan. 31, 1950 | W.W. Criley | Control Valve Mechanism for Clutches and Brakes | hydraulic valves |
