| 1955 |
Founding of Osaka Sanitary Metal Industries Cooperative Union's parent company, San-A Seisakusho. |
| 1969 |
San-A Seisakusho and 14 other companies linked together to form Osaka Sanitary Metal Industries Cooperative Union, to produce and sell sanitary grade products under the guidance of Osaka Prefecture and the Japan Small and Medium Enterprise Promotion Corporation. |
| 1976 |
Tokyo Office opened to build up the sales activities of the area. |
| 1988 |
First phase plant expansion. |
| 1990 |
Capital increased to 60 million yen by 3rd capital increase. |
| 1992 |
Promotion to Tokyo Office. |
| 1996 |
Fifth phase plant expansion. |
| 1999 |
Welfare house built. 30th anniversary of the Union. |
| 2000 |
No.2 plant built. |
| 2004 |
Test equipment establishment in No.2 plant. |
| 2005 |
System of three headquarters of business, production, and technology The 50th anniversary of founding Overseas subsidiary (100% investment) establishment in Chinese Chechiang province. RI JIA SANITARY METAL(JIAXING)CO.,LTD.
|
| 2007 |
Showroom & Presentation room built. (2015 Closed) |
| 2008 |
Techno center built. (2018 Closed) |
| 2014 |
Organizational change from cooperative business association to a stock corporation. |
| 2015 |
Shin-Osaka Office built. |
| 2016 |
Tokyo Life Innovation Center built. |
| 2018 |
Future Architect Center built.
(2021 Integrated into Tokyo Life Innovation Center.) |
| 2020 |
Tochigi Factory built. |
| 2022 |
Fukuoka Office built. |
