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certification acquired
Head Office and Plant (Iruma-shi, Saitama)
•Company outline
Head Office and Plant:
  11-10 Sayamagahara, Iruma-shi, Saitama, Japan
Capital: 400 million yen
Shareholder: Mitsui Mining and Smelting Co.,  
•To Mitsui Mining and Smelting Co.,
•Company history
Present Head Office and factory (in Iruma-shi, Saitama)
Meguro Factory (Meguro, Tokyo) at start
of full-scale operations (in 1932)
Dec 1913
  Kagoshima Electric Railway Co., Ltd. started to manufacture artificial abrasives for the first time in Japan.
Jun 1917
  Mitsui Mining Co., Ltd. succeeded the business of the abrasives department.
Jun 1927
  Meguro Laboratory (Tokyo) of Mitsui Mining Co., Ltd. started manufacturing grinding wheels.
Aug 1933
  New grinding wheel manufacturing plant constructed on the premises of the Meguro Laboratory.
  Regular operation started.
May 1950
  Following dissolution of the zaibatsu, company name changed to Kamioka Mining Co., Ltd.
Dec 1952
  Company name changed to Mitsui Mining and Smelting Co., Ltd.
  The plant became Meguro Grinding Wheel Plant of the company.
May 1963
  Technical tie-up for gear honing grinding wheels agreed with National Broach of USA.
Nov 1968
  Due to lack of space at Meguro Plant, relocation to Musashi Industrial Park in Iruma-shi, Saitama started.
Jun 1973
  Removal of plant completed, creating the newest & most
powerful plant in the industry.
Mar 1974
  Spun off from Mitsui Mining and Smelting Co., Ltd. to become an independent company.
  Mitsui Grinding Wheel Co., Ltd. established.
Apr 1976
  CBN Wheels and Diamond Wheels began to be marketed.
Mar 1990
  Technology transfer contract signed with Dongil Co., Ltd. of Korea.
Apr 1990
  Diamond pellet business transferred from Mitsui Mining and Smelting Co., Ltd. and operation started.
Nov 1994
  Mitsui Grinding Technology (Thailand) Co., Ltd. established.
May 2001
  ISO 9001 certification acquired.
Dec 2004
  Expanded MGT Thailand plant.
Mar 2005
  Certified for wide-area industrial waste disposal.
Mar 2006
  ISO 14001 certification acquired.
  OHSAS18001 certification acquired.
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