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