About VAN SIMAEYS F C
About Bell Telephone Mfg. Co., Belgium
About VAN DE WEGHE H
About Bell Telephone Mfg. Co., Belgium
About CHAN C K
About Bell Telephone Mfg. Co., Belgium
About Revue HF
About digital communication
About Exchange and switching systems
About ディジタル交換
About 応用
About 半導体技術