- Bossard Korea Ltd.
- Address:267 YOUNGDEOK-RI, GIHEUNG-EUP
- Seo-Ryung Precision Inc.
- Address:
- SWI Optical Corporation
- Address:Rm 503 E-Tech Valley, Wonhyoro3-Ga, Yongsan-Gu
- Ho Chun Industrial Co.
- Address:9FL, ROOM 903, Hyosung Intelian Officetel, 681-3,4 Deungchon-dong, Gangseo-gu
- Silla Co.,LTD.
- Address:Baekje Gobunlo 286-17
- Samil Co., Ltd.
- Address:1284-9,Jeongwang-dong ,Siheung-si
- Daichang
- Address:75-6,Samnak-dong ,Sasang-gu
- Wonchang Metal Co., Ltd
- Address:541-6,Won-dong
- SEUNGBO MECHA TECH
- Address:Gwanho1gil
- Namyoun HI-TECH
- Address:335-4 yudeung-ri, Daesan-myeon
- CJ Trading Co., Ltd.
- Address:123, Geomdan-ri, Iryu-myeon
- Basco
- Address:1284-10 Jeongwang-dong
- Dae Hyeung Metal Co.,Ltd
- Address:511-13,Jugyo-ri ,Yesan-eup ,Yesan-gun
- Jinhap Co., Ltd.
- Address:B-5,THE 2ND ESTATE DAEHWA-DONG DAEDUK-GU
- Jungsan Enterprise Co., Ltd.
- Address:1095-17,Joil-ri ,Samdong-myeon ,Ulju-gun
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