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| All Patents in class 251/73 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,154,827 | Apr. 18, 1939 | A. Von Wangenheim | Pressure Relief Device | pressure regulators | |
| 2,213,181 | Aug. 27, 1940 | A. Von Wangenheim | Pressure Relief Device | pressure regulators | |
| 2,404,853 | Jul. 30, 1946 | W.S. Landon | Fluid Control for Oil Burners | flow controls | |
| 2,851,065 | Sep. 09, 1958 | D.L. Billian, R.V. Klikunas | Automatic tank filling nozzle | locomotive diesel fuel apparatus | |