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Priority claimed from GB838315289Aexternal-prioritypatent/GB8315289D0/en
Priority claimed from GB838317491Aexternal-prioritypatent/GB8317491D0/en
Application filed by Frank Brian MercerfiledCriticalFrank Brian Mercer
Priority claimed from EP83305982Aexternal-prioritypatent/EP0122995B1/en
Application grantedgrantedCritical
Publication of ATE34195T1publicationCriticalpatent/ATE34195T1/en