| - March 1946 | Kuranobu Miwa founded Miwa Kikoshokai at 1-1, Tsutsui Town, Higashi Ward, Nagoya City. |
| - December 1950 | Chuo Koki Co., Ltd. was established as a corporate organization at 3-6 Takatsuji Town, Showa Ward, Nagoya City, and Kuranobu Miwa was appointed as Representative Director and President. |
| - December 1960 | Completion of the head office building |
| - March 1972 | Hamamatsu Office was established. |
| - June 1973 | Received a courtesy call from the head of Showa Tax Office, Nagoya Regional Taxation Bureau, as an excellent reporting corporation. |
| - March 1983 | Gifu Office and Mie Office were established. |
| - August 1986 | Completion of the second head office building |
| - December 1988 | Hiroyuki Hirabayashi was appointed as Representative Director and President. |
| - April 1991 | Toyama Office was established. |
| - January 1993 | Completion of the new head office building |
| - May 1993 | Toyohashi Office was established. |
| - June 1997 | The U.S. subsidiary GREENTEC PRECISION, INC. was established. |
| - November 2000 | Received a courtesy call for the sixth time as an excellent reporting corporation. |
| - July 2006 | Kyushu Office was established. |
| - October 2006 | Masahiro Hasegawa was appointed as Representative Director and President. |
| - June 2008 | Obtained ISO14001: 2004 certification. |
| - July 2008 | Haruki Miwa was appointed as Representative Director and President. |
| - September 2009 | Kumamoto Office was established. |
| - May 2010 | Kumamoto Office obtained ISO14001: 2004 certification. |
| - October 2011 | Yasuhiro Minoura was appointed as Representative Director and President. |
| - March 2012 | Fuji Office was established. |
| - May 2013 | Fuji Office obtained ISO14001: 2004 certification. |
| - November 2013 | CHUO SSK (THAILAND) CO., LTD. was established in Thailand. |
| - June 2018 | Completed shift to ISO14001: 2015. |
| - October 2019 | Okyo (Shanghai) Int’l Co., Ltd. was established in China. |
| - November 2019 | Anjo Office was established. |
| - October 2020 | Anjo Office obtained ISO14001: 2015 certification. |
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