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History

December 1963
Mimasu Industrial Sales Co., Ltd. is founded in Takasaki, Gunma for the purpose of selling measuring instruments and testing machines.
January 1966
The Polishing Department is established for processing semiconductor silicon wafers, and a factory is built in Gunma-machi, Gunma-gun, Gunma (present-day Ashikado-machi, Takasaki).
May 1969
Mimasu Industrial Sales Co., Ltd. opens the Ota Office in Ota-shi, Gunma.
June
The Polishing Department is spun off to establish Mimasu Semiconductor Industry Co., Ltd. in Gunma-machi, Gunma-gun, Gunma (present-day Ashikado-machi, Takasaki) for the purpose of mirror polishing processing of semiconductor silicon wafers.
November
Mimasu Semiconductor Industry Co., Ltd. builds its second plant in Gunma-cho, Gunma-gun, Gunma (present-day Ashikado-machi, Takasaki).
September 1972
The Mimasu Semiconductor Industry Co., Ltd. head office is moved to Kaminamiemachi, Takasaki, Gunma.
May 1974
Mimasu Engineering Co., Ltd. is founded in Gunma-machi, Gunma-gun, Gunma (present-day Ashikado-machi, Takasaki) to design and manufacture semiconductor manufacturing equipment and automated assembly and inspection systems.
September 1983
The Mimasu Semiconductor Industry Co., Ltd. head office is moved to 762 Ashikado-machi, Takasaki, Gunma (presently 762-1 Ashikado-machi, Takasaki).
December
The three companies merge as Mimasu Semiconductor Industry Co., Ltd., and the internal structure was reorganized into one management headquarters and three divisions.
July 1984
The Engineering Division is moved to Gunma-machi, Gunma-gun, Gunma (present-day Munadaka-machi, Takasaki).
August
The Shirakawa Office of the Industrial Sales Division is established in Shirakawa, Fukushima.
January 1986
Company stocks are registered with the Japan Securities Dealers Joint Association (the present-day Japan Securities Dealers Association) as over-the-counter stocks.
August
The Saitama Office of the Industrial Sales Division is established in Kumagaya, Saitama.
April 1991
The Semiconductor Division's Kamisato Plant K-I Building is constructed in Hotoda, Gunma-machi, Gunma-gun, Gunma (present-day Hotoda-machi, Takasaki).
May
The Utsunomiya Sales Office of the Industrial Sales Division is established in Utsunomiya, Tochigi.
May 1993
The Saitama Office of the Industrial Sales Division is moved to Fukaya, Saitama.
November 1995
The K-II Building is constructed at the Semiconductor Division's Kamisato Plant.
December 1996
The K-III Building is constructed at the Semiconductor Division's Kamisato Plant.
February 1997
The Ota and Utsunomiya Offices of the Industrial Sales Division were integrated to establish the Kita Kanto Office in Ashikaga, Tochigi.
April
Company stocks are listed on the second section of the Tokyo Stock Exchange.
May
The Shirakawa Office of the Industrial Sales Division is moved to Shinshirakawa, Fukushima.
November 1998
Company stocks are listed on the first section of the Tokyo Stock Exchange.
March 1999
The K-IV Building is constructed at the Semiconductor Division's Kamisato Plant.
December 2004
The K-V Building is constructed at the Semiconductor Division's Kamisato Plant.
February 2006
The head office is moved to 2174-1 Hodota-machi, Takasaki, Gunma.
February 2008
The K-VI Building is constructed at the Semiconductor Division's Kamisato Plant.
May 2014
The Mikawa Office of the Industrial Sales Division is established in Chiryu, Aichi.
April 2022
Company stocks are listed on the Prime Market of the Tokyo Stock Exchange.
November 2024
Becomes a wholly owned subsidiary of Shin-Etsu Chemical Co., Ltd