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| All Patents in class 91/194 | |||||
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| Number | Date | Patentee | Title | Type | |
| 821,236 | May 22, 1906 | T.H. Haberkorn | Valve Gear for Engines | steam engine valve gear | |
| 1,036,059 | Aug. 20, 1912 | A.D. Baker | Reversible Variable-Cut-Off Valve-Gear | steam engine valve gear | |