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Priority claimed from JP58238973Aexternal-prioritypatent/JPS60133165A/ja
Priority claimed from JP59171315Aexternal-prioritypatent/JPS6149071A/ja
Application filed by Nippon Telegraph & Telephone, Sho Bond Const, Communic Archi Buil Res CorpfiledCriticalNippon Telegraph & Telephone
Priority claimed from EP84115932Aexternal-prioritypatent/EP0146931B1/de
Application grantedgrantedCritical
Publication of ATE38262T1publicationCriticalpatent/ATE38262T1/de