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| All Patents in class 137/523 | |||||
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| Number | Date | Patentee | Title | Type | |
| 290,450 | Dec. 18, 1883 | C. Ahrens | Safety-valve | steam safety valves | |
| 395,536 | Jan. 01, 1889 | H.G. Ashton | Safety-valve | steam safety valves | |