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| All Patents in class 137/339 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,034,222 | Mar. 17, 1936 | H.S. Baker | Valve | steam safety valves | |
| 2,357,795 | Sep. 12, 1944 | W.E. Cowley, E.J. Dillman | Valve | refrigeration apparatus | |