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| All Patents in class 251/362 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,044,623 | Nov. 19, 1912 | C.L. Bailey | Valve | water valves | |
| 2,056,160 | Oct. 06, 1936 | H.L. Allen | Valve Element and the Method of Forming the Same | internal combustion engine valves | |