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
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.)
Western Electric Co Ltd Great Britain
AT&T Corp
Original Assignee
Western Electric Co Ltd Great Britain
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
Application filed by Western Electric Co Ltd Great Britain, Western Electric Co IncfiledCriticalWestern Electric Co Ltd Great Britain
Application grantedgrantedCritical
Publication of GB191403699ApublicationCriticalpatent/GB191403699A/en