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
Priority claimed from US07/125,975external-prioritypatent/US4843191A/en
Application filed by At & T CorpfiledCriticalAt & T Corp
Priority to SG115394ApriorityCriticalpatent/SG115394G/en
Publication of SG115394GpublicationCriticalpatent/SG115394G/en