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| All Patents in class 251/278 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 923,524 | Jun. 01, 1909 | F.G. Hobart | Valve for gas-engines | |
 | 1,470,974 | Oct. 16, 1923 | F. Hardinge | Valve | |
 | 1,546,580 | Jul. 21, 1925 | F. Hardinge | Valve | |