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History
| 2021.05 | Water and sewage equipments work business |
| 2020.03 | Establish Kookjegisan Corp. Dadae subsidiary |
| 2019.01 | RECTANGULAR SLUDGE COLLECTOR performance certification |
| 2015.05 | Register Gumi Goa factory |
| 2014.04 | Verify company annexed research institute |
| 2014.02 | Achieve water quality environment specialized construction business |
| 2013.07 | Verified as venture company |
| 2011.01 | Change company name into Kookjegisan Corp. |
| 2007.08 | Selected as ‘CLEAN business’ from Korea Occupational Safety Management Corporation |
| 2005.07 | Jangrim industrial complex factory etc. |
| 2001.01 | GK Corp. |
| 2000.02 | Achieve Exclusive construction machinery equipment work business |
| 1992.02 | Establish Deokwoong Machinery |