- OPTOTEK
- Address:# 204 anyangbubjotown, 1433-1 kaunyangdong, dongan-gu
- Artec Inc.
- Address:# 1644-229 daedae-ri, ungchon-myeon
- Booil Material Ind. Co.,Ltd.
- Address:656-447,Seongsu-dong 1-ga ,Seongdong-gu
- SMC korea
- Address:1270-8, jeongwang-Dong
- Unilock Co., Ltd.
- Address:# 1409 Mega Bldg. , Sk n Technopark, 190-1 Sangdaewon-Dong, Jungwon-Gu
- INOFF CO., LTD
- Address:407, Daewon-ri, Jillyang-eup
- DONGHWA KEYAS
- Address:419-8 CHEONGCHEON DONG, BUPYEONG GU
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