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| Patents for Wibrandus J. Koppius | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,109,660 | Nov. 05, 1963 | W.J. Koppius, E.C. Wahl | Seal Assembly | ||
| 3,116,066 | Dec. 31, 1963 | W.J. Koppius | Mating Ring and Seal | ||