| Months and Years |
History |
| March 1940 |
Kazuto Mukaiyama establishes Koa Kogyo in Tokyo to start the manufacturing of fixed resistors. |
| Desember 1941 |
The company opens Ina plant (at the location of the present head office) in Ina, Nagano to expand its manufacturing capacity. |
| May 1947 |
The company becomes a joint-stock corporation. |
| Desember 1950 |
The company changes its name to Koa Denko Co., Ltd. |
| June 1955 |
The company becomes a JIS (Japanese Industrial Standards) authorized manufacturer. |