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| All Patents in class 251/358 | |||||
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| Number | Date | Patentee | Title | Type | |
| 556,037 | Mar. 10, 1896 | C.W. Weiss | Valve | internal combustion engine valves | |
| 1,044,828 | Nov. 19, 1912 | J. Stumpf | Distribution-valve for steam-engines | steam engine valves | |