About HATOKO MASATOSHI
About MUKAI TOMOKAZU
About 大豊建設
About cost
About super express
About system
About preparation(servicing)
About cost reduction
About orbit(trajectory)
About velocity
About infrastructure
About 建設単価
About Railroad construction planning and surveying
About 新幹線
About 建設
About 単価
About ローコスト
About 整備
About 費用