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| All Patents in class 251/309 | |||||
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| Number | Date | Patentee | Title | Type | |
| 91,337 | Jun. 15, 1869 | W.H. Howland | Improvement in steam-engine stop-valves | steam engine valves | |
| 215,806 | May 27, 1879 | G.H. Corliss | Exhaust Valve for Steam Engines | steam engines | |