Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Broadcasting CorpfiledCriticalBritish Broadcasting Corp
Priority claimed from PCT/GB1982/000205external-prioritypatent/WO1983000269A1/en
Application grantedgrantedCritical
Publication of ATE50678T1publicationCriticalpatent/ATE50678T1/de