May 1954  The Company was founded.   February 1963  Listed on the Second Section of the Tokyo Stock Exchange.   December 1963  Adopted the shield tunneling method in telephone tunnel construction work (Shirogane).   February 1972  Listed on the First Section of the Tokyo Stock Exchange.   June 1978  Started laying submarine coaxial cables (Libya).   April 1982  Branched out into the software business.   February 1983  Began work on the 1,200-km optical fiber cable that runs the length of Japan.   June 1986  Entered the environment business.   May 1991  Changed company name to Kyowa Exeo.   May 1993  Opened the Research and Development Center.   April 1998  Entered the IT business.   April 1999  Relocated the head office.   March 2000  Forged business alliance with Daimei Telecom Engineering Corp.   April 2001  Merged with Showa Technos Corp.   June 2002  Acquired ash fusion business from Niigata Engineering Co., Ltd.   July 2002  Established Customer Service Center offering maintenance and repair service 24 hours a day, 365 days a year.   May 2003  Completed first unit of a biogas plant (Iwate Prefecture).   April 2004  Acquired Daiwa Densetsu Corp.   May 2004  Acquired Wako Engineering Corp.   April 2005  Acquired KANAC Corp.