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Priority claimed from GB878722643Aexternal-prioritypatent/GB8722643D0/en
Priority claimed from GB878730038Aexternal-prioritypatent/GB8730038D0/en
Application filed by Engelhard Tech LtdfiledCriticalEngelhard Tech Ltd
Priority claimed from EP19880308797external-prioritypatent/EP0309243B1/de
Application grantedgrantedCritical
Publication of ATE93280T1publicationCriticalpatent/ATE93280T1/de