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Priority claimed from GB878700777Aexternal-prioritypatent/GB8700777D0/en
Priority claimed from GB878730160Aexternal-prioritypatent/GB8730160D0/en
Application filed by Mead CorpfiledCriticalMead Corp
Priority claimed from EP19880300277external-prioritypatent/EP0275200B1/en
Application grantedgrantedCritical
Publication of ATE68767T1publicationCriticalpatent/ATE68767T1/en