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| All Patents in class 251/240 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,109,807 | Sep. 08, 1914 | L. Skinner, E.F. Williams | Valve Gear for Steam Engines | steam engine valve gear | |
| 2,214,272 | Sep. 10, 1940 | E.J. Dillman | Fuel Supply Control Means | flow controls | |