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| All Patents in class 251/124 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,414,751 | Jan. 21, 1947 | O.H. Ludeman | Valve | steam engine valves | |
| 3,102,555 | Sep. 03, 1963 | L.A. Botkin | Floating restrictor for dispensing nozzle | ||