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Priority claimed from GB898910722Aexternal-prioritypatent/GB8910722D0/en
Priority claimed from GB898918703Aexternal-prioritypatent/GB8918703D0/en
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Priority claimed from EP90304979Aexternal-prioritypatent/EP0404322B1/de
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Publication of ATE94875T1publicationCriticalpatent/ATE94875T1/de