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4859493 | Lemelson | Aug 1989 | |
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5489449 | Umeya | Feb 1996 | |
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5616368 | Jin et al. | Apr 1997 | |
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5935461 | Witherspoon et al. | Aug 1999 | |
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4-350175 | Dec 1992 | JP |
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Entry |
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