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Priority claimed from GB848410900Aexternal-prioritypatent/GB8410900D0/en
Priority claimed from GB848426753Aexternal-prioritypatent/GB8426753D0/en
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Priority claimed from EP85302881Aexternal-prioritypatent/EP0163416B1/en
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Publication of ATE43579T1publicationCriticalpatent/ATE43579T1/en