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| All Patents in class 137/532 | |||||
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| Number | Date | Patentee | Title | Type | |
| 59,764 | Nov. 20, 1866 | C.M. Farrar | Improvement in Lock-Up Safety Valve | steam safety valves | |
| 85,792 | Jan. 12, 1869 | G.H. Clemens | Improvement in steam safety-valves | steam safety valves | |
| 86,346 | Feb. 02, 1869 | J. Ashcroft | Safety Valve | steam safety valves | |
| 94,747 | Sep. 14, 1869 | B. Holly | Water Pipe Safety Valve | water valves | |
| 168,914 | Oct. 19, 1875 | N.E. Nash | Governors for Steam Engines | steam engine governors | |