| 1969.02 | Established Ehken Kogyo Corporation in Isehara-cho, Naka-gun, Kanagawa-ken.Commenced manufacture and sales of automobile filters. |
| 1971.10 | Built a new factory in Hamaoka-cho, Ogasa-gun, Shizuoka-ken. |
| 1972.03 | Transferred the Head Office to Hamaoka-cho, Ogasa-gun, Shizuoka-ken. |
| 1972.07 | Changed the company name to Eiken Industries Co., Ltd. |
| 1973.03 | Expanded the press factory (Installation of large press line). |
| 1973.04 | Established Tohbu Eiken Corporation in Isehara-shi, Kanagawa-ken. |
| 1973.09 | Acquired Nippon Element. |
| 1976.01 | Expanded the gas appliance production line (Establishment of mass-production). |
| 1976.04 | Established Eiken Inc. in Shizuoka-shi, Shizuoka-ken. |
| 1980.03 | Changed the company name from Nippon Element to Koshin Kogyo. |
| 1992.10 | Built a new press factory for the purpose of rationalizing large press lines. |
| 1992.12 | Consolidated Koshin Kogyo and opened Ohyama factory. |
| 1994.11 | Consolidated Tohbu Eiken Corporation and opened Isehara factory. |
| 1995.11 | Consolidated Eiken Inc. |
| 1997.05 | Registered with Japan Securities Dealers Association. |
| 1997.12 | Built a new dormitory for single employees. |
| 1999.06 | Obtained ISO 9001 certificate. |
| 2000.10 | Expanded the assembly factory. |
| 2001.01 | Transferred Ohyama factory to Head Office. |
| 2001.03 | Received the Energy Conservation Center Grand Prix for the Year 2000.
(For microcomputer-controlled fryer GF-24) (Energy Conservation Center Chairman Award) |
