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| All Patents in class 137/469 | |||||
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| Number | Date | Patentee | Title | Type | |
| 69,527 | Oct. 01, 1867 | G. Smith, J.N. Wrigley | Improvement in steam safety-valves | steam engine valves | |
| 306,208 | Oct. 07, 1884 | R. Gould, H.G. Ashton | Safety Valves | steam safety valves | |
| 2,183,650 | Dec. 19, 1939 | G.L. Gundersen, E. Klafstad | Relief Valve | steam safety valves | |
| 2,792,015 | May 14, 1957 | R.V. Smith | Liquid relief valve | pressure regulators | |
| 2,815,040 | Dec. 03, 1957 | R.V. Smith | Pressure relief valve | steam safety valves | |