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Priority claimed from US07/176,805external-prioritypatent/US4846941A/en
Priority claimed from US07/188,557external-prioritypatent/US4849303A/en
Application filed by Du PontfiledCriticalDu Pont
Priority claimed from EP89303099Aexternal-prioritypatent/EP0335683B1/de
Application grantedgrantedCritical
Publication of ATE96185T1publicationCriticalpatent/ATE96185T1/de