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| All Patents in class 251/78 | |||||
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| Number | Date | Patentee | Title | Type | |
| 162,401 | Apr. 20, 1875 | G.L. McCahan | Steam Engine Governor | steam engine governors | |
| 2,267,688 | Dec. 23, 1941 | W.S. Landon | Control Device | flow controls | |