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| All Patents in class 251/356 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 15,030 | Jun. 03, 1856 | H.R. Worthington | Method of attaching stems to conical valves | ||
 | 1,772,406 | Aug. 05, 1930 | L.E. Whiton | Valve | |
| 2,200,163 | May 07, 1940 | E.J. Dillman | Control Device | ||