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| 2004. 08 |
construction company license (structure maintenance and repair) |
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| 2004. 11 |
patent No. 0427909 for "Expandable joint replacement construction method for concrete-preserving maintenance" |
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| 2004. 11 |
increase of 200 million won (520 million won) |
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| 2004. 12 |
construction company license (metal structure installation) |
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| 2004. 12 |
patent No. 03513124 for "Intelligence discharge lamp ballast stabilizer ignition system and control method" |
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