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Priority claimed from GB898901421Aexternal-prioritypatent/GB8901421D0/en
Priority claimed from GB898901420Aexternal-prioritypatent/GB8901420D0/en
Application filed by Alexander George CopsonfiledCriticalAlexander George Copson
Priority claimed from EP90300701Aexternal-prioritypatent/EP0380301B1/en
Application grantedgrantedCritical
Publication of ATE98141T1publicationCriticalpatent/ATE98141T1/en