Company History
| 1958 | May | Establishes OTE Kosan Co., Ltd. as a subsidiary of Mitsubishi Metal Mining Corporation (current
Mitsubishi Materials Corporation). Head Office: Tokyo / Branch office: Osaka / Capital: 2 million Japanese yen |
|---|---|---|
| 1964 | Nov. | Splits off Mining Development Division to establish OTE Kaihatsu Co., Ltd. |
| 1970 | Nov. | Splits off Smelting Division to establish OTE Metals Co.,Ltd. |
| 1985 | June | Opens Iwaki Technical Center. |
| 1986 | Apr. | Consolidates the head office in Kudanshita, Chiyoda-ku. |
| 1990 | Apr. | Changes the company name to Techno OTE Corporation. Opens Akita Technical Center. |
| 1994 | Feb. | Splits off Processing Division to establish Techno OTE Kako Co., Ltd. (current MMC Ryotec Corporation) |
| 1996 | Oct. | Opens Minokamo Technical Center. |
| 1998 | Jan. | Opens Iwaki Technical Center Izumi. |
| Oct. | Splits off Filter Division to establish Shinryo Filtech Co., Ltd. (current Shinryo Aquair Co., Ltd.) | |
| 1999 | Apr. | Opens Environmental Engineering Center. |
| 2001 | Apr. | System Technical Center. |
| 2002 | May | Acquires Osaka Chemical Analysis Center. |
| 2003 | Jan. | Changes the company name to Mitsubishi Materials Techno Corporation. Capital: 1,042.85
million Japanese yen. Succeeds operation of Nuclear Energy Engineering Division from Mitsubishi Materials Corporation. |
| Apr. | Merges with Tamagawa Machinery Co., Ltd. Succeeds operation of Environmental Engineering Division from Mitsubishi Materials Corporation. |
|
| May | Opens Environmental Energy Center | |
| 2006 | June | Completes the Clean Plant construction at Nagaoka Plant. |
| 2007 | June | Completes the 2nd phase of Clean Plant construction at Nagaoka Plant. |
| 2008 | Apr. | Merges with Mitsubishi Materials Natural Resources Development Corporation (Succeeds the business of former OTE Kaihatsu Co., Ltd.). |
| 2011 | Apr. | Stops using Environmental Energy Center as an analysis center and starts using it as a regional office in Hirosaki (Osaka Chemical Analysis Center). |
| 2012 | Apr. | Merges with Sernuc Corporation |
| June | Closes a regional office in Hirosaki of Osaka Chemical Analysis Center. | |
| Oct. | Closes Minokamo Technical Center and System Technical Center. | |
| 2013 | Oct. | Consolidates all the equipment manufacturing plants (Akita Technical Center, Iwaki Technical Center, and Nagaoka Plant) in Nagaoka (Technical Center Nagaoka). |
| 2016 | Apr. | Changes the name, Technical Center Nagaoka, to Nagaoka Plant. |
| 2018 | June | Consolidates the Kudan head office, Kiba Office, Saitama Office in Akihabara. |
| June | Converted Tohsoh Corporation into a group company | |
| Nov. | Expands clean plants at Nagaoka Plant | |
| 2019 | Mar. | Conducts new construction of Nagaoka Plant Kosei Building and expansion of the third assembly plant. |
| 2022 | Sep. | Begins renewal construction of Nagaoka Plant (expected to be completed in Oct. 2024). |
| 2023 | Apr. | The Nagaoka Plant is in charge of the Device Division. |
| 2024 | June | Transferred all shares of Tohsoh Corporation to Mitsubishi Kakoki Kaisha, Ltd. |