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| All Patents in class 91/326 | |||||
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| Number | Date | Patentee | Title | Type | |
| 358,435 | Mar. 01, 1887 | G.E. Dow | Steam Engine | steam engines | |
| 899,849 | Sep. 29, 1908 | A.G. Stokes | Steam Actuated Valve for Engines | steam engine valves | |