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| All Patents in class 137/470 | |||||
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| Number | Date | Patentee | Title | Type | |
| 62,477 | Feb. 26, 1867 | G.H. Clemens, D.G. Coppin | Improvement in lock-up safety-valves | ||
| 2,597,057 | May 20, 1952 | T.W. Bergquist | Safety valve | steam safety valves | |