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Priority claimed from GB878718429Aexternal-prioritypatent/GB8718429D0/en
Priority claimed from GB888811437Aexternal-prioritypatent/GB8811437D0/en
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Priority claimed from EP88306645Aexternal-prioritypatent/EP0302627B1/de
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Publication of ATE90034T1publicationCriticalpatent/ATE90034T1/de