Yoshihisa Omura

Tsuken Corp. engages in the information and telecommunications business. It operates through the following divisions: Telecommunication Equipment, Telecommunication Services, and Sales Leasing. The company was founded on April 2, 1951 and is headquartered in Sapporo, Japan.

Part of COMSYS Holdings Corp., SANWA COMSYS Engineering Corp. is a Japanese comprehensive engineering company for information and communication, offering faster and more optimal total solutions from consulting to maintenance. The company is based in Tokyo, Japan. SANWA COMSYS Engineering, also known as sankom, contributes to the future of the smart society by providing a range of services including consulting, proposals, design, construction, operation, and maintenance for information and communication and electrical facilities.

Nippon COMSYS Corp. provides telecommunications infrastructure services. These includes fiber optic cable installation, cable tunnel construction, and wireless communications base station construction. It also offers general civil engineering services and building construction. The company was founded in December, 1951 and is headquartered in Tokyo, Japan.

Nippon Telegraph & Telephone East Corp. provides regional telecommunications services. It offers telephone service applications and changes, billings and payment solutions, discount options, optional services, Internet services, wireless communication network services and business network. The company was founded on July 1, 1999 and is headquartered in Tokyo, Japan.