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| All Patents in class 91/187 | |||||
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| Number | Date | Patentee | Title | Type | |
| 473,906 | May 03, 1892 | M.C. Bullock | Valve Gear for Steam Engines | steam engine valve gear | |
| 2,094,159 | Sep. 28, 1937 | H.G. Mueller | Valve Mechanism for Steam Engines | steam engine valve gear | |