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
CA 56902
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
American Telephone and Telegraph Co Inc
Publication date
Priority to CA 56902priorityCriticalpatent/CA56902S/en
Application grantedgrantedCritical
Publication of CA56902SpublicationCriticalpatent/CA56902S/en