About GOTO HIROKAZU
About 日本電気 C&C情報研
About SAKAGUCHI MITSUHITO
About 日本電気 光エレクトロニクス研
About NAGASHIMA KUNIO
About 日本電気 C&Cシステム研
About optical communication
About Exchange and switching systems
About Optical communication systems and equipment
About 光通信
About 光交換