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| All Patents in class 137/475 | |||||
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| Number | Date | Patentee | Title | Type | |
| 536,693 | Apr. 02, 1895 | R. Gould | Safety-valve | steam safety valves | |
| 921,360 | May 11, 1909 | F. Casey | Safety-Valve | steam safety valves | |
| 2,001,375 | May 14, 1935 | H.S. Baker | Safety Valve | steam safety valves | |