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