Corporate History
| April 1974 | Osamu Sato, NTKJ President, founded the Japan Optical Technology Research Institute in Kawaguchi City, Saitama Prefecture. |
| June 1978 | The institute was reorganized into a limited company named Nihon Tokushu Kogaku Jushi Co., Ltd. Capital: 3 million yen The head office and plant were relocated to Itabashi-ku, Tokyo. |
| February 1982 | A new plant was established at 3-7-10 Shingashi, Itabashi-ku, Tokyo, and the head office was relocated to the same address. |
| July 1984 | Capital was increased to 9 million yen. |
| February 1986 | A new plant, Kumagaya Dies Plant at 138-6 Mizugahara, Kumagaya City, Saitama Prefecture, was established. |
| July 1992 | Capital was increased to 10 million yen. |
| May 1997 | A new molding plant was established at 2686-1 Mochida, Gyoda City, Saitama Prefecture. |
| October 2005 | The Gyoda Plant was relocated and expanded to become the Kumagaya Molding Plant. |