A large cross sectional, Inc. ( DAI-DAN Co., Ltd. ), the tube construction and electrical installation work in the company that the industry, abbreviation of the old company name "Osaka Electric Heating", "Daidan" is at the origin of the current name "a large cross sectional" .. The head office is 1-9-25 Edobori, Nishi-ku, Osaka-shi, Osaka. Although it is a member company of the Midorikai and belongs to the Sanwa Group, it is a member company of the Owakai.