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| All Patents in class 251/338 | |||||
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| Number | Date | Patentee | Title | Type | |
| 20,919 | Jul. 13, 1858 | B. Holly | Damper | stove pipes | |
| 85,792 | Jan. 12, 1869 | G.H. Clemens | Improvement in steam safety-valves | steam safety valves | |
| 113,517 | Apr. 11, 1871 | B. Holly | Safety Valve | steam safety valves | |
| 331,246 | Nov. 24, 1885 | J.W. Kenyon | Steam-trap | ||
| 2,141,711 | Dec. 27, 1938 | B.M. Guthrie | Automatic Air Control Means | fans and blowers | |