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| D370690 | Pangburn et al. | Jun 1996 | |
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| 4564302 | Hatazawa | Jan 1986 | |
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| 4846597 | Bryant et al. | Jul 1989 | |
| 5383735 | Smiley | Jan 1995 | |
| 5876131 | Parker et al. | Mar 1999 |