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| All Patents in class 251/89 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,213,181 | Aug. 27, 1940 | A. Von Wangenheim | Pressure Relief Device | pressure regulators | |
| 2,427,059 | Sep. 09, 1947 | W.S. Landon | Flow Control Means | flow controls | |
| 2,914,292 | Nov. 24, 1959 | A. Anderson | Tracer valve | ||