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| All Patents in class 251/280 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,395,551 | Nov. 01, 1921 | C.F. Brand | Snap Movement Valve Mechanism | industrial valves | |
| 3,168,125 | Feb. 02, 1965 | L.P. Rosell | Lever operated nozzle | ||