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
Western Electric Co 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
Priority claimed from US06/105,620external-prioritypatent/US4298443A/en
Application filed by Western Electric Co IncfiledCriticalWestern Electric Co Inc
Application grantedgrantedCritical
Publication of CA1144891ApublicationCriticalpatent/CA1144891A/fr