About SAKAKIBARA HAJIME
About 住友電気工業
About USAMI TSUTOMU
About 住友電気工業
About ITAKURA SEIJI
About 日本信号
About TAJIMA TERUYUKI
About UTMS協
About 電気学会道路交通研究会資料
About traffic control system
About Traffic control surveillance and regulations
About Other computer utilization technology
About 日本
About 制御方式