Kumagai Gumi. 

Kumagai Gumi Co., Ltd. operates as a construction company in Japan and internationally. The company constructs tunnels, roads and bridges, railways, dams, and airports/marine ports, as well as water and sewerage, environmental, energy, renewal, ICT civil engineering, housing/mansion, office/government, hotel, commercial, culture, education/research, sports/entertainment, medical/social welfare, plant, distribution, and other projects. It also engages in the production of asphalt mixture and the paving of roads, airports, ports, bridges, etc.; building renovation business, including building survey/diagnosis, antiseismic diagnosis and reinforcement, and renovation plans; construction of semiconductor plants and golf courses; and manufacture of steel products for shield tunnels and temporary construction machinery, as well as designing/producing/installing soil decontamination equipment and leasing of steel frames. In addition, the company provides construction and building plans, and applications for projects; construction education to universities and construction companies; technical support services; and insurance agency services, as well as operates as a technology trading company for construction industry. Kumagai Gumi Co., Ltd. was founded in 1898 and is headquartered in Tokyo, Japan.