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5709367 | Heintz et al. | Jan 1998 | A |
5839713 | Wright | Nov 1998 | A |
6491275 | Goodman et al. | Dec 2002 | B1 |
6631878 | Adam | Oct 2003 | B1 |
6634612 | Shin et al. | Oct 2003 | B1 |