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4751160 | Plighta et al. | Jun 1988 | |
4786499 | Slane et al. | Nov 1988 | |
5093216 | Azuma et al. | Mar 1992 |
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0357001 | Mar 1990 | EPX |
2641130 | Jun 1990 | FRX |
WO9013924 | Nov 1990 | WOX |
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