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Priority claimed from GB838318602Aexternal-prioritypatent/GB8318602D0/en
Application filed by Indep Broadcasting AuthorityfiledCriticalIndep Broadcasting Authority
Priority claimed from EP84902718Aexternal-prioritypatent/EP0148918B1/en
Application grantedgrantedCritical
Publication of ATE30288T1publicationCriticalpatent/ATE30288T1/en