Number | Date | Country | Kind |
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2000-347853 | Nov 2000 | JP |
Number | Name | Date | Kind |
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5994963 | Kawai et al. | Nov 1999 | A |
6172567 | Ueno et al. | Jan 2001 | B1 |
6259901 | Shinomiya et al. | Jul 2001 | B1 |
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