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D386225 | Chen | Nov 1997 | |
D387401 | Huang | Dec 1997 | |
4290600 | Kolbel | Sep 1981 | |
4863162 | Neckamm et al. | Sep 1989 | |
5160304 | Van Der Hoeven | Nov 1992 | |
5637066 | Chang | Jun 1997 | |
5651755 | Chen | Jul 1997 |