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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone CorpfiledCriticalNippon Telegraph and Telephone Corp
Priority to JP56206351ApriorityCriticalpatent/JPS58106599A/ja
Priority to US06/448,085prioritypatent/US4570232A/en
Priority to FR8221431Aprioritypatent/FR2518783A1/fr
Priority to DE19823247229prioritypatent/DE3247229A1/de
Publication of JPS58106599ApublicationCriticalpatent/JPS58106599A/ja
Publication of JPH0420197B2publicationCriticalpatent/JPH0420197B2/ja