| 1947, August |
Established as Tokyo-Seitei-Jo in Taihei-cho, Sumida-ku Tokyo. |
| 1959, August |
Moved to Kitasuna-cho, Koutou-ku Tokyo. |
| 1963, April |
Capital participation by Sumikin-Bussan Co.,Ltd. |
| 1964, October |
Company name was changed to Tokyo Seisen Co.,Ltd. |
| Specialized in iron wire and flat wire. |
| 1973, March |
Partly moved to Ichikawa Factory Area. (No.4 and 5 Factory Buildings) |
| 1979, June |
Sold Kitasuna Factory. |
| Main office and factory all move to Ichikawa area. |
| 2010, March |
gained ISO9001：2008 certification. |
| 2010, December |
gained JIS G 3532 （SWM-B、SWM-P、SWM-C） certification. |
| 2013, October |
The shareholders Sumikin Bussan Co., Ltd. merged with Nippon Steel Trading Co., Ltd., and became Nippon Steel Sumikin Bussan. |
| 2019, April |
The shareholders Nippon Steel Sumikin Bussan Co., Ltd. changed its name to Nippon Steel Bussan Co., Ltd. |
