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.)
Expired
Application number
CA837298A
Inventor
Pohl Karl-Heinz
T. Spencer Arthur
F. Westover Robert
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
Publication date
Application grantedgrantedCritical
Publication of CA837298ApublicationCriticalpatent/CA837298A/en