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| All Patents in class 251/328 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,414,751 | Jan. 21, 1947 | O.H. Ludeman | Valve | steam engine valves | |
| 2,677,876 | May 11, 1954 | R.E. Juhnke, G. Castera | Method of fabricating a valve member having a body and seat of different metals | ||