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.)
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 to FR589792DpriorityCriticalpatent/FR589792A/fr
Priority to NL19252Dprioritypatent/NL19252C/xx
Application filed by Western Electric Co IncfiledCriticalWestern Electric Co Inc
Priority to GB3024725Aprioritypatent/GB246771A/en
Publication of GB246771ApublicationCriticalpatent/GB246771A/en