| All Patents in class 137/423 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 2,133,226 | Oct. 11, 1938 | A.G. Hann | Control Device | flow controls |
| 2,139,616 | Dec. 06, 1938 | A.K. Foulds | Control Device | flow controls |
| 2,228,037 | Jan. 07, 1941 | P.S. Russel | Fuel Controlling Apparatus | flow controls |
| 2,230,911 | Feb. 04, 1941 | P.S. Russel | Control Device | flow controls |
| 2,416,267 | Feb. 18, 1947 | W.S. Landon | Automatic Orifice Cleaning Device | pipe and orifice cleaners |
| 2,494,395 | Jan. 10, 1950 | W.S. Landon | Magnetically Operated Safety Valve Closing Device | flow controls |
