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Priority claimed from GB848412431Aexternal-prioritypatent/GB8412431D0/en
Application filed by British Broadcasting Corp, Telediffusion Fse, France Etat, Indep Broadcasting Authority, Marconi Co Ltd, Philips Nv, Plessey Co PlcfiledCriticalBritish Broadcasting Corp
Priority claimed from EP87201249Aexternal-prioritypatent/EP0247703B1/en
Application grantedgrantedCritical
Publication of ATE57284T1publicationCriticalpatent/ATE57284T1/en