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Priority claimed from GB838304748Aexternal-prioritypatent/GB8304748D0/en
Priority claimed from GB838320386Aexternal-prioritypatent/GB8320386D0/en
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Priority claimed from EP84300586Aexternal-prioritypatent/EP0119699B1/en
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Publication of ATE35280T1publicationCriticalpatent/ATE35280T1/en