Sumitomo Mitsui Banking Corp, The Chuo Mitsui Trust and Banking Co., Ltd., Mitsui Life Insurance Co., Ltd., The Gunma Bank Ltd., The Bank of Nagoya Ltd.
Founded as the first domestic company to manufacture precision machining tools which had been supplied by overseas manufacturers.
1942
Merged with Mitsui KousakuKi K.K. and Mitsui Seiki Kogyo was established.
1981
Consolidated the Okegawa Factory into the Kawajima-Machi, Saitama Pref., expanding the new Kawajima Factory
1994
The head office was moved to Simomaruko, Ota-Ku, Tokyo.
1995
The Tokyo Factory and the Kawajima Factory were certified for "ISO9001".
2001
The head office and the Tokyo Factory were consolidated into the Kawajima Factory to establish a new head office and a main factory. The Tokyo Head Office was established in Higashi-Shinagawa, Shinagawa-Ku, Tokyo.