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 TelecommfiledCriticalBritish Telecomm
Priority claimed from PCT/GB1986/000117external-prioritypatent/WO1986005339A1/en
Application grantedgrantedCritical
Publication of ATE61178T1publicationCriticalpatent/ATE61178T1/de