- Nano Optics
- Address:Gyeonggi-do Gwonseon-gu
- Pichina Optical Co., Ltd.
- Address:277-14,Ojeong-dong ,Daedeok-gu
- MuHan Trading Co., Ltd
- Address:970-7, Gyesan-dong, Gyeyang-gu
- TOPEX CORPORATION
- Address:522-5 Yonghyun-dong Uijongbu-si Kyonggi-do Korea
- MIRE ETECH CO.,LTD
- Address:483-92 eub nae-dong dae duk-gu
- SOMETECH INC.
- Address:2F, ByuckSan Digital Valley III, 212-13, Guro-Dong, Guro-Gu
- Itech Co.
- Address:RM602, DEARYUNG TECHNO TOWN III, # 448, GASAN-DONG, GUMCHUN-GU
- WTS
- Address:776-1
- GLONIK
- Address:806 Partners Tower 1 Cha, Gasan-dong
- Ampelos enterprise
- Address:RM406, 1st innoplex B / D, 371-47
- AJUHITEK INC.
- Address:
- K-Mac
- Address:104-11,Munji-dong ,Yuseong-gu
- Moochang international
- Address:rm1406,Hanwah obelisk office, 555, Dowhadong, Mapo-gu
- Seron Technologies Inc.
- Address:
- POTEC CO LTD
- Address:
- PEMTRON CORPORATION
- Address:1406, Byucksan Digital Valley VI, 481-4, Gasan-Dong, Geumcheon-Gu,
- HanKwang Opto Corp
- Address:563-4, Shipjung-Dong, Bupyung-Gu,
- Mecasys Co., Ltd.
- Address:10F, 640-3, Banseok-dong, Yuseong-gu