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| All Patents in class 251/174 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,111,399 | Sep. 22, 1914 | A.W. Morse | Valve | valves | |
| 1,354,966 | Oct. 05, 1920 | J.C. Glenn | Engine Valve Mechanism | steam engine valve gear | |
| 1,983,803 | Dec. 11, 1934 | H.G. Mueller | Steam Engine Valve | steam engine valves | |