Legal status (The legal status 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 status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
AT&T Technologies Inc
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 AT&T Technologies IncfiledCriticalAT&T Technologies Inc
Priority claimed from PCT/US1980/001216external-prioritypatent/WO1981001087A1/fr
Publication of JPS56501110ApublicationCriticalpatent/JPS56501110A/ja
Publication of JPS6412423B2publicationCriticalpatent/JPS6412423B2/ja