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
CA237,709A
Inventor
Robert L. Carbrey
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 CA163,667Aexternal-prioritypatent/CA985435A/en
Application filed by Western Electric Co IncfiledCriticalWestern Electric Co Inc
Priority to CA237,709ApriorityCriticalpatent/CA1003135A/en
Application grantedgrantedCritical
Publication of CA1003135ApublicationCriticalpatent/CA1003135A/en