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| All Patents in class 137/528 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,736X | Aug. 27, 1831 | T. Ewbank | Hydrostatic safety-valve for steam boilers | steam safety valves | |
| 455,001 | Jun. 30, 1891 | J.E. Lonergan | Testing-yoke for safety-valves | steam safety valves | |
| 1,189,764 | Jul. 04, 1916 | H.L. Whitman | Relief-valve for internal-combustion engines | internal combustion engines | |