- Hanbyul Patent Technology Development Ltd.
- Address:# 407, daegun bldg. , 822-5, yeoksam-dong
- Seamax International Co.,Ltd.
- Address:53-1, Dangsandong, dangsan bldg
- Hoya international
- Address:hae un dae
- JEONYOUNG ELECTROCHEMICAL CO LTD
- Address:637-1, Seonggok-Dong,
- Sewha Corp.
- Address:5f. , Songjeon Bldg. 52 Samsungdong, Kangnamku
- Mirae Tech Inc.
- Address:1162-17, Sinnam-Dong