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Priority claimed from GB858518571Aexternal-prioritypatent/GB8518571D0/en
Priority claimed from GB868609179Aexternal-prioritypatent/GB8609179D0/en
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Priority claimed from EP86304858Aexternal-prioritypatent/EP0209990B1/de
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Publication of ATE59165T1publicationCriticalpatent/ATE59165T1/de