- February 1987
- Established Sumiju Thermo Tech Co., Ltd. (15 million yen capital) and Sumiju Toyo Machinery & Engineering (7 million yen capital; limited private company)
- October 1990
- Merged above two companies as Sumiju Tec Max Co., Ltd. (50 million yen capital)
- April 2000
- Began production of mechanical models for Sumitomo Heavy Industries; changed company name to Sumiju Equipment System Co., Ltd.
- January 2002
- Increased capital to 200 million yen
- June 2002
- Acquired business rights of mechanical system models from Sumitomo Heavy Industries
- April 2003
- Acquired business rights related to coke oven machines from Kobukuro Techno Co., Ltd.
- December 2009
- Integrated steel structure and equipment business of Sumitomo Heavy Industries; changed company name to Sumitomo Heavy Industries Process Equipment Co., Ltd. (480 million yen capital)
- July 2014
- Acquired distillation and extraction business rights from Sumiju Plant Engineering
