- June 1946
- Established as a diesel engine service shop in Iizuka, Fukuoka, capitalized at 150,000 yen.
- Jan 1947
- gan servicing bulldozers, excavators, and railroad engines.
- Dec 1950
- Head office and plant relocated to Fukuoka City in response to continued growth.
- March 1958
- Licensed as Type 1 Service Shop by Ministry of Transport.
- July 1961
- Fukuoka Office of Japan Air Self-Defense Force, Air Materiel Command, Supply Depot No. 1 established in head office.
- Sept 1963
- Approved as designated vehicle service provider by Fukuoka Office, Kyushu District Transport Bureau.
- July 1969
- Capital increased to 50 million yen.
- Aug 1971
- Capital increased to 60 million yen.
- May 1978
- “Intellect is Infinite” adopted as company slogan.
- May 1982
- Capital increased to 75 million yen.
- April 1991
- Licensed for equipment and machinery installation construction.
- Jan 1992
- Licensed for general construction including civil engineering, architectural, electrical, landscaping, and fire prevention works.
- June 1994
- New head office plant constructed in Shingu Town, Fukuoka Prefecture
- June 1996
- Licensed for general construction including piping work.
- Feb 1997
- Capital increased to 99.46 million yen.
- Dec 1997
- Plant certified for privately owned electrical power generation.
- April 1999
- Certified under ISO9002 (ISO9001 certification received April 2002).
- April 2002
- Licensed for privately owned electrical power generation.
- Feb 2006
- License changed to general construction for equipment and machinery installation construction.
- Oct 2007
- Certified under ISO14001.