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| All Patents in class 91/327 | |||||
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| Number | Date | Patentee | Title | Type | |
| 407,338 | Jul. 23, 1889 | J.G. Downie | Steam Engine | steam engines | |
| 602,161 | Apr. 12, 1898 | A. Howard | Motive Engine | steam engines | |
| 630,767 | Aug. 08, 1899 | C.H. Beadle | Rotary Distributing Valve | steam engine valves | |
| 893,188 | Jul. 14, 1908 | I.E. McElroy | Cut Off Valve for Engines | steam engine valves | |
| 1,785,455 | Dec. 16, 1930 | H.G. Mueller | Steam Engine | steam engines | |