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| All Patents in class 251/176 | |||||
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| Number | Date | Patentee | Title | Type | |
| 23,714 | Apr. 19, 1859 | C.A. Schultz | Steam Balanced Valve | steam engine valves | |
| 1,112,233 | Sep. 29, 1914 | R.C. Stevens | Poppet Valve | steam engine valves | |