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| All Patents in class 137/543.23 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 123,546 | Feb. 13, 1872 | H.G. Ashton | Improvement in Lock Safety-Valves for Steam-Boilers | |
| 910,711 | Jan. 26, 1909 | H.C. McCarthy | Safety Valve | ||
| 921,360 | May 11, 1909 | F. Casey | Safety-Valve | ||
 | 944,330 | Dec. 28, 1909 | M.A. Hudson | Steam safety-valve | |
| 1,032,482 | Jul. 16, 1912 | W.E. Jerauld | Safety Valve | ||
| 2,001,375 | May 14, 1935 | H.S. Baker | Safety Valve | ||