| Customer | Method | Period |
|---|---|---|
| Jungsuk Marine Construction | RT,UT | 09/2004 ~12/2005 |
| Daerim Industry | RT,UT MT,PT | 11/2003 ~12/2004 |
| Hyundai Construction | RT,UT MT,PT | 2003.11 ~04.12 |
| Samsung Engineering & Construction | RT,UT, MT,PT | 2003.11 ~04.12 |
| Chungam Construction | RT,UT | 2003.11 ~03.12 |
| Woori Marine | RT,MT | 2005.05 ~05.07 |
| Daewoo Motors | RT,UT | 2003.11 ~03.12 |
| Whison Construction | RT,UT | 2004.06 ~ 04.10 |
| Hyomyong Construction | RT,UT | 2003.11 ~ 05.10 |
| Hyundai Construction | RT,UT | 2005.10 ~ present |
| Daewoo Construction | MT | 2005.09 ~ 05.11 |
| Samwon Construction | RT,UT | 2004.06 ~ 04.09 |
| Tae Heung Construction & Industrial | RT,UT | 2004.12 ~05.06 |
| Hyundai PR | RT,UT, MT,PT | 2008.01 ~08.12 |
| Unison | RT,UT, MT,PT | 2008.01 ~08.12 |
| Nawoon | RT,UT, MT,PT | 2008.01 ~08.12 |