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Land, Infrastructure and Transportation Ministry Hokkaido Development Bureau | Tohoku Engineering Office | Kanto Technical and Engineering Office | Hokuriku Technical and Engineering Office | Chubu Technical and Engineering Office | Chugoku Technical and Engineering Office | Shikoku Technical and Engineering Office | Kyusyu Technical and Engineering Office | MLIT,Tokyo Airport | MLIT,Niigata Port and Airport Construction | MLIT,Hiroshima Port and Airport Construction | MLIT,Takamatu Port and Airport Construction | MLIT,Kumamoto Port and Airport Construction | MLIT,Miyazaki Port and Airport Construction | MLIT,Kagoshima Port and Airport Construction | Kanto District Transport Bureau
Other ministries and agencies North Kanto Defense Bureau | Chugoku-Shikoku Defense Bureau | Kyusyu Defense Bureau | Kumamoto Defense Bureau | Board of Audit of Japan | Tokyo Legal Affairs Bureau| Ministry of the Environment
Prefectures and government-designated municipalities Yamagata | Ibaraki | Chiba | Tokyo | Nagano | Tottori | Shimane | Yamaguchi | Kagosima | Nagoya-shi | Hiroshima-shi | Kitakyusyu-shi
City Tachikawa-shi | Musashino-shi | Gifu-shi | Hachiouji-shi | Machida-shi | Hiratsuka-shi | Sodegaura-shi | Ichinomiya-chou | Kasugai-shi | Sakaide-shi | Toyoda-shi | Toyohashi-shi | Sasebo-shi | Kitahiroshima-chou | Iizuka-shi | Miyazaki-west-Land Development Corporation | Okinawa-shi
Special corporations Public Works Research Institute Tsukuba Central Research Institute・Civil Engineering Research Institute for Cold Region | Japan International Cooperation Agency | RIKEN | Japan Racing Association | Nippon Expressway Research Institute Co., Ltd | Central Nippon Expressway Co., Ltd | West Nippon Expressway Co., Ltd | Honshu-Shikoku Bridge Expressway Co., Ltd | Hanshin Expressway Company Limited | Japan Automobile Research Institute | Japan Road Contractors Association | Gifu Horserace Union | Nagoya Expressway Public Corporation | Japan Cooperation Center Petroleum
Construction company ※ gaeart | KAJIMA CORPORATION | KOMOTO INDUSTRIES | Kitagawa Hutec Co., Ltd | Seikitokyukogyo | TAISEI CORPORATION | Taisei Rotec Corporation | TAIYU CORPORATION | TAKENAKA Road Construction Co., Ltd | Chizaki Doro Co., Ltd | TOKIWAKOGYO | TOA ROAD CORPORATION | Toda Doro | TOBISHIMA CORPORATION | TOYOTA WOODYOU HOME | Nishimatsu Constration Co., Ltd | NIPPO CORPORATION | NIPPO Kansetsu Co., Ltd | NICHIREKI Co., Ltd | HASEGAWA SPORTS FACILITIES Co., Ltd | FUKUDA ROAD CONSTRUCTION Co., Ltd | FUJITA ROAD CONSTRUCTION Co., Ltd | MAEDA ROAD CONSTRUCTION Co., Ltd | SUMIKEN MITSUI ROAD Co., Ltd
Consultant ※ ORIENTAL CONSULTANTS | DEVELOPMENT ENGINEERING INSTITUTE Co., Ltd | Kosaka Engineering Consultants | JR KYUSHU CONSULTANTS COMPANY | JRA FACILITIES Co., Ltd | JFE TECHONS | NIPPON STEEL & SUMIKIN ENGINEERING Co., Ltd | CHODAI Co., Ltd | Central Nippon Highway Engineering Nagoya Ltd | West Nippon Expressway Engineering Shikoku Co., Ltd |  West Japan Engineering Consultants | Nippon Koei | JAPAN PORT CONSULTANTS. Ltd | Nexco-East Engineering Co., Ltd | Pacific Consultants Co., Ltd.
Othen private enteprise ※ AIRPORT MAINTENANCE SERVICE CORPORATION | Goldman Sachs Realty Japan | SUBARU | Sojitz Corporation | Chiyoda Techno Ace Co.Ltd. | Tokyo Energy & Systems Inc | NIKKO | Hinode,Ltd | BSRA Alpha1 | Marubeni

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