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| All Patents in class 251/25 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 636,907 | Nov. 14, 1899 | F. Lane | Whistle Valve | ||
 | 2,211,646 | Aug. 13, 1940 | L.A. Cole | Valve | |
| 2,713,826 | Jul. 26, 1955 | W.H. Tinker | Fluid Pumping System | ||