| All Patents in class 251/74 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 711,398 | Oct. 14, 1902 | B.M. Hanson | Fluid Operated Stop Valve and Alarm | valves |
| 927,434 | Jul. 06, 1909 | W. Dieter, H.W. Shonnard | Air-heater for compressed-air engines | hot air engines |
| 2,133,226 | Oct. 11, 1938 | A.G. Hann | Control Device | flow controls |
| 2,228,037 | Jan. 07, 1941 | P.S. Russel | Fuel Controlling Apparatus | flow controls |
| 2,234,088 | Mar. 04, 1941 | P.S. Russel | Control Device | flow controls |
| 2,317,556 | Apr. 27, 1943 | P.S. Russel | Liquid Level Controlling Means | liquid level controls |
