|MITSUBISHI STEEL MFG. CO., LTD.||MITSUBISHI STEEL CO., LTD.|
|April 1917||Tokyo Spring Works (established in 1904),
the first spring manufacturer in Japan, and
Tokyo Steel Works (established in 1916)
merged into Tokyo Steel Co., Ltd.
|May 1919||Established as Nagasaki Steel Works of Mitsubishi Shipbuilding & Engineering Co., Ltd., and commenced manufacturing Steel castings and forgings.|
|May 1924||Bought up Hirota Steel Works and Commenced manufacture of steels.|
|April 1934||Changed name to Mitsubishi Heavy Industries, Ltd.|
|April 1937||Became independent from Nagasaki Shipbuilding & Engineering Works and started out as Nagasaki Steel Works of Mitsubishi Heavy Industries, Ltd.|
|December 1940||Changed name to Mitsubishi Steel Co., Ltd.|
|August 1941||Fukagawa Steel Works newly established.|
|August 1942||Mitsubishi steel Mfg. Co., Ltd. established, to succeed Nagasaki Steel Works of Mitsubishi Heavy Industries, Ltd.|
|December 1942||Two Mitsubishi companies merged into Mitsubishi Steel Mfg. Co., Ltd.|
|December 1949||Nagasaki Steel Mfg. Co., Ltd. and Tokyo Steel Co., Ltd., newly organized in conformity with the Enterprises Reconstruction and Rehabilitation Law.|
|Nagasaki Steel Mfg. Co., Ltd.||Tokyo Steel Co., Ltd.|
|December 1949||Nagasaki Steel Mfg. Co., Ltd. took over operations of Nagasaki Steel Works of former Mitsubishi Steel Mfg. Co., Ltd.||Tokyo Steel Co., Ltd. took over operations of Ohjima Works, Fukagawa Steel Works and Hirota Steel Works.
Center: Fukagawa Steel Works
Right: Hirota Steel Works
|December 1952||Changed name to Mitsubishi Steel Co., Ltd.|
|June 1953||Changed name to Mitsubishi Steel Mfg. Co., Ltd.|
|September 1963||Utsunomiya Works newly established.
|February 1964||Two firms merged into Mitsubishi Steel Mfg. Co., Ltd.|
|Mitsubishi Steel Mfg. Co., Ltd.|
|April 1965||Ohjima Works and Fukagawa Steel Works combined into as Tokyo Works.
|May 1967||Ichikawa Works newly established
|May 1970||Japan Casting & Forging Corporation established as a joint venture with Nippon Steel Corporation and other firms to produce large steel castings and forgings.
|January 1975||Assembled Parts Division of Nagasaki Works (former Nagasaki Steel Works) was carved out newly established as Mitsubishi Nagasaki Machinery Mfg. Co., Ltd. as a joint venture with Mitsubishi Heavy Industries, Mitsubishi Bank and five other Mitsubishi organizations.
|May 1978||Newly established Ichikawa Springs Factory.
|February 1983||Ryokoh Casting Co., Ltd. established to produce steel castings.|
|July 1986||Rockwell International Suspension Systems Company established in Canada for manufacturing and sales of automotive springs, as a venture with Rockwell International Corporation in the U.S.
(Company name changed to Meritor Suspension Systems Company in October 1997.)
|October 1991||Rockwell International Suspension systems Company U.S. established in the U.S. for manufacturing and sales of automotive springs, as a venture with Rockwell International Corporation in the U.S.
(Company name changed to Meritor Suspension Systems Company U.S. in October 1997.)
|February 1993||Chiba Works newly established.
|March 1994||Steel Bar Division of Tokyo Works transferred to Muroran City, and its production shifted to Mitsubishi Steel Muroran Inc. established by Mitsubishi Steel's 70% investment.
|October 1994||Bangkok Magnet Corporation established in Thailand for manufacturing and sales of casting magnets, by acquiring the share of Bangkok Spring Industrial in Thailand. (Company name changed to MSM(Thailand) Co., Ltd. in October 2000.)
|March 1999||Precision casting products operations for industrial gas turbine blades and vanes etc.. transferred to Mitsubishi Heavy Industries.|
|December 1999||Launched Precision Spring Business at BANGKOK MAGNET CORPORATION Co.,Ltd.
Company name changed to MSM(Thailand)Co.,Ltd. In October 2000.
|August 2000||Precision Springs Cebu, Inc. and Precision Springs Manila, Inc. of Precision Springs Co., Ltd. made 100 percent subsidiaries in order to expand precision parts operations.
(In July 2004, company names changed to MSM Cebu, Inc. and MSM Manila, Inc.)
|September 2001||Ichikawa Spring Factory is Consolidated at Chiba Works.|
|December 2002||Precision casting production transferred completely to MSM(Thailand) Co., Ltd. from Utsunomiya Works.|
|December 2002||MSM Ningbo Co., Ltd. established in China for manufacturing and sales of precision assemblies.|
|April 2004||Acquired Human Electric Co., Ltd. a Electronics parts maker, in order to expand precision parts operations.|
|December 2004||Transferred MSM NINGBO CO.,LTD.to neighborhood for expanding production volume.|
|March 2005||Consolidated sales, development, and production sections of Precision Parts Business Divisions into Shiohama, Ichikawa-city.|
|March 2005||Consolidated Die sections at Utsunomiya Works and Precision Parts Business Division, and newly opened Die Center at Ichikawa Shiohama.|
|April 2005||Acquired Precision Springs Co.,Ltd.|
|April 2005||Hirota Works established, absorbing Precision Spring Co., Ltd. and Ryokoh Casting Co., Ltd.
|February 2006||MSM Ningbo Spring Co., Ltd. established in China for manufacture and sales of Automotive Springs.
|July 2006||PT. MSM Indonesia established in Indonesia.
|October 2006||Human Electric Co., Ltd, Acquired.|
|October 2009||Acquired JV partner's holding share of Meritor Suspension Systems Company and Meritor Suspension Systems Company U.S., and name changed to MSSC CANADA and MSSC US.
|December 2012||Utsunomiya Works is closed.
|April 2013||Integrated holding companies and operational companies in North America(the US and Canada), and changed the company names respectively to MSSC CANADA INC., MSM US INC. and MSSC INC.|
|September 2013||MSM MANILA, INC. is closed.|
|April 2014||Established two joint ventures with Stumpp Schuele & Somappa Springs Pvt. Ltd. in MSM Spring India Pvt. Ltd. and Stumpp Schuele & Somappa Auto Suspension Systems Pvt. Ltd.
|August 2014||Acquired an equity stake in an Indonesia Special Steel Bar Electric Furnace maker with the intention to develop overseas business in Special Steel Bars Business.|
|March 2016||Opened the JAKARTA BRANCH of PT. MSM INDONESIA in Indonesia.|
|April 2016||Opened a Research and Development Center within the Chiba Works.
|April 2016||Established MSSC MFG MEXICANA, S.A. DE C.V.,a newly established subsidiary in Mexico aiming at production and distribution of automotive springs.
|January 2018||Acquired additional shares of PT. JATIM TAMAN STEEL MFG., and made it subsidiary company.|
|April 2018||Acquired whole shares of Gebrüder Ahle GmbH & Co. KG("Ahle"), spring manufacture in Germany. (In September, Company name changed to MSSC Ahle GmbH.)