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| All Patents in class 251/220 | |||||
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| Number | Date | Patentee | Title | Type | |
| 860,141 | Jul. 16, 1907 | J.P. Lavigne | Quick Opening Valve | industrial valves | |
| 1,719,801 | Jul. 02, 1929 | G.B. Duffield | Valve | valves | |