June 1959	Nobuyoshi Tominaga founded in Yayoi-cho, Kochi Prefecture
March 1962	Established Tominaga Foundry Co., Ltd.
June 1965	Relocated to Maruike-cho, Kochi, founding ironworks division
August 1971	Morihiko Tominaga appointed as Representative Director
May 1987	Relocate to Kochi City Nunoshida Kochi Machinery Industrial Park
June 1988	Become a Lloyd-class certified factory
April 1991	Company name changed to Tominaga Corporation
July 1994	Techno Kochi Factory completed in Myoken, Nankoku City
November 1995	Become a Norwegian-class certified plant
March 2007	The company's workshop modification work is over.
March 2008	Techno Kochi second plant completed
July 2010	Techno Kochi third factory completed
August 2010	Relocation of the Head Office Iron and Steel Department (To Techno 3rd Plant)
December 2012	Three-dimensional measuring machine introduced to techno factory
November 2013	Makoto Shimada appointed as Representative Director
December 2013	Introduce 3D casting simulation (manufacturing subsidy)
May 2014	Established Konan Plant
August 2014	Foundry large dust collector equipment introduction (manufacturing subsidy)
October 2015	Electric furnace renewal to IGBT system 2 power source 2 furnace
December 2015	Head office plant LED lighting set up (energy saving subsidy) introduced Toshiba turning processing machine
March 2017	Techno factory new horizontal MC introduced
July 2017	3D scanner introduction (manufacturing subsidy)