Number | Date | Country | Kind |
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8715635 | Jul 1987 | GBX |
This is a division application of Ser. No. 212,748, filed on June 28, 1988, now issued to U.S. Pat. No. 4,906,761.
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Billington et al., JCS, Chem. Commun., 1011-1013 (1987). |