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Priority claimed from GB858516161Aexternal-prioritypatent/GB8516161D0/en
Priority claimed from GB868603575Aexternal-prioritypatent/GB8603575D0/en
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Priority claimed from EP19860304477external-prioritypatent/EP0208427B1/en
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Publication of ATE50278T1publicationCriticalpatent/ATE50278T1/en