- Kum Kang Quartz Co., Ltd.
- Address:422 Chong-ri,Yeongcheon-ri ,Dongtan-myeon ,Hwaseong-si
- inter burgo
- Address:130-5 samjeon-dong
- YEDREEN
- Address:A-1608, Samho B / D, 275-1 Yangjae-dong, Seocho-gu
- Boram Chemetal
- Address:Yecheon-gun Jinae-ri 311-8
- Worldex
- Address:360,Hanggok-ri,Goa-eup ,Gumi-si
- SAC
- Address:175-87 ANKUK BLDG. ANKUK-DONG, JONGRO-GU
- Seoul Quartz Co., Ltd.
- Address:345,Gasan-dong ,Geumcheon-gu
- Semi-One Eng Co.,Ltd
- Address:189-21 Karak-dong.Songpa-Gu.Seoul
- JBSC Asia
- Address:482-5, Yeonsan-Dong,
- Young Shin Quartz Co., Ltd.
- Address:149-3, Hoejuk-ri, Gwanghyewon-myeon, Jincheon-gun
- stoneasia co.
- Address:502,hyundai appt ,sewoon sanga chongno-3ga chongno gu
- BORAM CHEMETAL CO LTD
- Address:311-8, Ginae-ri, Yechon-up
- SLPC Global Co. LTD.
- Address:2005 Hanbit Plaza Shinchon Dong
- HANWHA L&C CORP
- Address:Junggu
- tos
- Address:180-13 whaseo
- Dong Ho
- Address:
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