| 1974-10 |
|
| 1974-10 |
Established Satou Industry Co., Ltd. |
| 1975-04 |
|
| 1975-04 |
Obtained construction business license |
| 1975-10 |
Relocated to 340-1 Kami-nagara, Joetsu City, Niigata Prefecture |
| 1977-08 |
|
| 1977-08 |
New construction of the ironworks |
| 1989-02 |
|
| 1989-02 |
New construction of the head office factory |
| 1990-03 |
Certified by the Minister of Construction |
| 1990-03 |
Received M-grade certification for steel structure manufacturing plant from the Minister of Construction |
| 1992-11 |
|
| 1992-11 |
Opened Anzuka factory |
| 2003-12 |
|
| 2003-12 |
Obtained special construction business license |
| 2008-12 |
|
| 2008-12 |
Installed a large column assembly robot at the head office factory |
| 2009-01 |
|
| 2009-01 |
Installed a column welding robot at the head office factory |
| 2011-02 |
Certified by the Minister of Land, Infrastructure, Transport and Tourism |
| 2011-02 |
Received H-grade certification for steel structure manufacturing plant from the Minister of Land, Infrastructure, Transport and Tourism |
| 2012-12 |
|
| 2012-12 |
Established an external product yard at the head office factory |
| 2013-01 |
|
| 2013-01 |
Installed a 10-ton bridge crane and a mobile painting booth |
| 2013-09 |
|
| 2013-09 |
Installed a large column assembly robot at the head office factory |
| 2015-04 |
Implemented at the head office factory |
| 2015-04 |
Introduced two Ishimatsu multi-layer welding robots at the head office factory |
| 2016-01 |
Renewal of certification by the Minister of Land, Infrastructure, Transport and Tourism |
| 2016-01 |
Updated H-grade certification from the Minister of Land, Infrastructure, Transport and Tourism |
| 2016-02 |
Conducted at the Anzuka factory |
| 2016-02 |
Updated shot blasting equipment at Anzuka factory |
| 2016-03 |
Implemented at the head office factory |
| 2016-03 |
Added three Ishimatsu multi-layer welding robots at the head office factory and updated cutting machines at Anzuka factory |
| 2016-04 |
|
| 2016-04 |
Head office factory: New external product yard on the south side, 10‑ton bridge crane installed. |
| 2017-04 |
Implemented at the head office factory |
| 2017-04 |
|
| 2017-04 |
Head office factory: New dice processing plant, lightweight steel processing plant, and paint shop; small‑shape steel composite machine introduced; Anzuka factory: drill machine and band saw expansion; primary processing factory with two lines. |
| 2018-04 |
Implemented at the head office factory |
| 2018-04 |
Head office factory: Beam worker introduced. |
| 2018-12 |
Operated as a continuous core assembly welding hub |
| 2018-12 |
Ue‑Yoshino worksite opened, operating as a continuous core assembly welding base. |
| 2019-10 |
Operated as a lightweight steel processing hub |
| 2019-10 |
Relocated small-sized steel composite machine and beam worker from head office factory to Sanwa factory |
| 2019-10 |
Miwa factory opened, operating as a lightweight steel processing base; small‑shape steel composite machine and beam worker moved from the head office factory. |
| 2020-10 |
|
| 2020-10 |
Certified by the Ministry of Economy, Trade and Industry |
| 2020-10 |
Miwa factory: 10‑ton bridge crane installed, selected as a regional future driving company by the Ministry of Economy, Trade and Industry. |
| 2021-01 |
Renewal of certification by the Minister of Land, Infrastructure, Transport and Tourism |
| 2021-01 |
Ministry of Land, Infrastructure, Transport and Tourism minister certification H‑grade renewal. |
| 2021-10 |
|
| 2021-10 |
Listed on the Tokyo PRO Market with ticker code 3450 |
| 2021-10 |
Miwa factory site expansion: beam processing plant construction started, listed on the Tokyo PRO Market. |
| 2022-04 |
|
| 2022-04 |
Miwa factory: beam processing plant operating. |
| 2022-10 |
Implemented at the head office factory |
| 2022-10 |
Head office factory: multi‑layer welding robot 70 mm compatible, one Ishimatsu added. |
| 2022-12 |
Renewal of certification by the Minister of Land, Infrastructure, Transport and Tourism |
| 2022-12 |
Ministry of Land, Infrastructure, Transport and Tourism minister certification H‑grade renewal. |
| 2023-07 |
Added a column welding robot at the head office factory |
| 2023-07 |
Introduced two units at the Sanwa factory |
| 2023-07 |
Head office factory: added beam welding system to column welding robot; Miwa factory: two beam welding robots introduced. |
| 2024-02 |
Miwa factory: new paint shop. |
| 2024-07 |
Commenced operation at the Sanwa factory |
