| All Patents in class 251/175 |
Patents 1 -
9
of 9
      |
| Number | Date | Patentee | Title | Type |
| 15,400 | Jul. 22, 1856 | H.R. Worthington | Relieving steam slide-valves from pressure | steam engine valve gear |
| 167,865 | Sep. 21, 1875 | J.F. Allen | Improvement in balanced valves | steam engine valves |
| 204,018 | May 21, 1878 | H.F. Frisbie | Puppet-Valve | steam engine valves |
| 248,728 | Oct. 25, 1881 | H.F. Frisbie | Puppet Valve | steam engine valves |
| 1,014,591 | Jan. 09, 1912 | W.F. Gould | Balanced Valve | steam engine valves |
| 1,014,592 | Jan. 09, 1912 | W.F. Gould | Balanced Valve | steam engine valves |
| 1,744,037 | Jan. 21, 1930 | W.R. Brown | Spray Gun | spray guns |
| 1,942,589 | Jan. 09, 1934 | G.A. Biggs | Hydraulic Turbine | turbine water wheels |
| 2,972,357 | Feb. 21, 1961 | C.S. Gladoske, R.L. Ford | Hydraulic Rotary Selector Valve | hydraulic apparatus |
