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
CA806750A
Inventor
H. Helfrich John
A. Heller Kenneth
C. Townley Ray
George W. Smith, Jr.
Albert E. Spencer, Jr.
L. Nicodemus Keith
E. Corbin Joseph
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 CA806750ApublicationCriticalpatent/CA806750A/en