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| All Patents in class 91/159 | |||||
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| Number | Date | Patentee | Title | Type | |
| 309,278 | Dec. 16, 1884 | C.C. Worthington | Duplex compound engine | steam pumping engines | |
| 471,253 | Mar. 22, 1892 | C.T. Noyes, T.W. Heintzelman | Valve Gear for Compound Engines | steam engine valve gear | |