| 1940 |
Mar. |
Koa Kogyo-sya is established by Kazuto Mukaiyama in Tokyo to manufacture fixed resistors. |
| 1941 |
Dec. |
Establishes Ina Factory (at the location of the present registered office) in Ina, Nagano to expand its manufacturing capacity. |
| 1942 |
Jul. |
Begins production of capacitors. |
| 1943 |
Oct. |
Establishes Nagoya Local Office. |
| 1944 |
May |
Gets certified as a Labor-Relations-Adjustment-Act (Article 2) applicable factory. |
| 1946 |
Apr. |
Establishes a corporate logo. |
| 1947 |
May |
Gets certified as a key factory for telecommunication sector by the Commercial and Industrial Office. |
| May |
Becomes a joint-stock corporation. [Capital: 0.8M JPY] |
| Jun. |
Establishes Tokyo Office and Nagoya Office. |
| 1948 |
Sep. |
Increases the capital. (fully paid-up) [Capital: 1.6M JPY] |
| 1950 |
Nov. |
Closes Nagoya Office. |
| Nov. |
Establishes Kansai Office in Osaka. |
| Dec. |
Changes its name to KOA DENKO Co., Ltd. |
| 1953 |
Nov. |
Increases the capital. (fully paid-up) [Capital: 2.6M JPY] |
| 1955 |
Jun. |
Becomes a Japanese Industrial Standards (JIS) authorized manufacturer. |
| Jul. |
Establishes Kanda Sales Office in Tokyo. |
| 1956 |
Mar. |
Increases the capital. (fully paid-up) [Capital: 4.8M JPY] |
| Dec. |
Receives an award for being an excellent factory by the Minister of Health, Labour and Welfare. |
| 1957 |
Feb. |
Increases the capital. (fully paid-up) [Capital: 9.6M JPY] |
| 1958 |
Apr. |
Establishes Minowa Factory in Minowa-machi, Kamiina-gun, Nagano. |
| 1959 |
Feb. |
Establishes Kawasaki Office in Kawasaki-shi. |
| Jul. |
Increases the capital. (fully paid-up) [Capital: 19.2M JPY] |
| Nov. |
Becomes a NDS XXC6442 (Japan Defense Agency Standard) authorized manufacturer of fixed film resistors. |