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Priority claimed from US06/893,522external-prioritypatent/US4717782A/en
Priority claimed from US06/903,915external-prioritypatent/US4740645A/en
Application filed by Mobil Oil CorpfiledCriticalMobil Oil Corp
Priority claimed from EP87306688Aexternal-prioritypatent/EP0256707B1/de
Application grantedgrantedCritical
Publication of ATE58716T1publicationCriticalpatent/ATE58716T1/de