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Copper sulfate (5)CAS RN:7758-98-7;10124-44-4
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Shinwon Chemical & Trading Corp.Telephone:+82-2- 87701067
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Yumin CorporationTelephone:0082-2-711-4033
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Kolon International CorportionTelephone:82-2-3677-8275
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DONGWON TRADING CORPTelephone:82-2-3673-3295 / 82-11-292-0293
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Trace Mineral CompanyTelephone:82 - 55-26755700