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| All Patents in class 137/509 | |||||
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| Number | Date | Patentee | Title | Type | |
| 27,704 | Apr. 03, 1860 | F. Douglas | Improved steam-trap | steam engines | |
| 881,848 | Mar. 10, 1908 | G.W. Day | Water Relief Valve | water valves | |
| 1,693,109 | Nov. 27, 1928 | W. Ernst | Semiautomatic Valve | hydraulic valves | |