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4012927 | Apr 1990 | DEX |
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3296594 | Van Heerden | Jan 1967 | |
4731772 | Lee | Mar 1988 | |
4742219 | Ando | May 1988 | |
4845352 | Benschop | Jul 1989 | |
4929823 | Kato et al. | May 1990 |
Number | Date | Country |
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3406677 | Sep 1985 | DEX |
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