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| All Patents in class 251/327 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 147,584 | Feb. 17, 1874 | B.F. Wilson | Improvement in stop-valves | |
 | 236,780 | Jan. 18, 1881 | Z.E. Coffin | Stop-valve | |
| 659,234 | Oct. 09, 1900 | J. Hughes | Blow Off Valve | ||