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| All Patents in class 251/336 | |||||
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| Number | Date | Patentee | Title | Type | |
| 335,892 | Feb. 09, 1886 | J.P. Kern, J.C. Cosford | Steam Engine Governor | steam engine governors | |
| 1,133,601 | Mar. 30, 1915 | R. Wood | Ejecting Device | feedwater apparatus | |