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| All Patents in class 137/473 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,103 | Jul. 06, 1852 | E. Rogers | Mode of Grinding Puppet-Valves While the Engine is in Motion | steam engine valves | |
| 86,346 | Feb. 02, 1869 | J. Ashcroft | Safety Valve | steam safety valves | |
| 303,252 | Aug. 12, 1884 | H.G. Ashton | Safety Valves | steam safety valves | |
| 1,356,854 | Oct. 26, 1920 | G.H. Clark | Safety Valve | steam safety valves | |
| 1,380,094 | May 31, 1921 | G.H. Clark | Safety Valve | steam safety valves | |
| 1,393,258 | Oct. 11, 1921 | A.B. Carhart | Safety Valve | steam safety valves | |