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5248910 | Yockey et al. | Sep 1993 | A |
5296772 | Bradfield et al. | Mar 1994 | A |
6162142 | Hori et al. | Dec 2000 | A |
6229233 | Torii et al. | May 2001 | B1 |
6288464 | Torii et al. | Sep 2001 | B1 |