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Priority claimed from JP53141862Aexternal-prioritypatent/JPS597364B2/ja
Priority claimed from JP16297678Aexternal-prioritypatent/JPS5588018A/ja
Priority claimed from JP2167879Aexternal-prioritypatent/JPS55113020A/ja
Application filed by Nippon Telegraph & TelephonefiledCriticalNippon Telegraph & Telephone
Publication of IT7949977A0publicationCriticalpatent/IT7949977A0/it
Application grantedgrantedCritical
Publication of IT1209904BpublicationCriticalpatent/IT1209904B/it