Koichi Tanaka

DC CO., LTD. engages in the manufacture and sale of cement, mixed concrete, and other concrete related products. Its operations are carried out through the following segments: Cement-related, Resources, Environmental, Real Estate Leasing, Ready-mixed Concrete, and Living Life. The Cement-related segment manufactures and sells cement products. The Resources segment sells coarse and fine sands; and gravel and crushed stones. The Environmental segment deals with the recycling business. The Real Estate Leasing segment manages the lease of real estate properties and the solar power electricity sales. The Ready-mixed Concrete segment sells ready-mixed concrete products. The Living Life segment provides rainwater reservoir penetration and exterior related products. The company was founded on October 1, 2003 and is headquartered in Kawasaki, Japan.

Kunimiyama Shigen KK is a Japanese company that provides lime mining services.

Part of Taiheiyo Cement Corp., DC Chiba Shigen KK is a Japanese company that engages in the production and sale of sand. The company is based in Kimitsu, Japan.