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| All Patents in class 137/590 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,197,262 | Apr. 16, 1940 | P.S. Russel | Control Device | flow controls | |
| 2,518,339 | Aug. 08, 1950 | W.S. Landon | Flow Control Means | flow controls | |