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Priority claimed from GB878718532Aexternal-prioritypatent/GB8718532D0/en
Priority claimed from GB888809173Aexternal-prioritypatent/GB8809173D0/en
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Priority claimed from EP88306948Aexternal-prioritypatent/EP0302662B1/de
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Publication of ATE81036T1publicationCriticalpatent/ATE81036T1/de