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Priority claimed from GB868620247Aexternal-prioritypatent/GB8620247D0/en
Application filed by De Beers Cons Mines LtdfiledCriticalDe Beers Cons Mines Ltd
Priority claimed from PCT/GB1987/000565external-prioritypatent/WO1988001378A1/en
Application grantedgrantedCritical
Publication of ATE70913T1publicationCriticalpatent/ATE70913T1/en