Japan Bridge Corporation
Lines of Business: Design, fabrication and construction of steel bridges, building skeletons, transmission towers, and other steel structures. Design, fabrication and construction of snow-melting devices, and other environmental products.

Kawada Industries, Inc.
Business Activities: To design and construct bridges, pre-beams, steel structures, steel towers, etc. Civil and architectural designing and construction. To design, manufacture, repair, and sell aircraft. To train helicopter pilots and mechanics. To design, manufacture, and install various machinery. To sell, mediate, lease, and manage real estate.
Other business and investments relating to the aforementioned activities.

Matsuo Bridge Co., Ltd.

Shiraishi Corporation
Shiraishi carries extensive architecture and development businesses. We cover the planning, designing construction and after care for various facilities including offices/commercial buildings, production/distribution facilities, education/research facilities, apartment house buildings, sports/leisure facilities, etc. everywhere in the nation. By fully using its diverse technological force, Shiraishi conducts the quality control and quality assurance of a whole structure from bottom to top.

TOMOE Corporation
Business activities : Construction Department, General construction, Space structures (Planning,design, fabrication, erection), Structural Steel Department, Electric power transmission towers, Micro towers, Structural steels (Design, fabrication and erection), Bridge/Steel frames (Design, fabrication, erection)