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• Incheon

  • IncheonSihwa Factory

• Gyeonggi

  • HwaseongJangan Factory
  • HwaseongHwaseong Factory
  • AnsanSiheung Factory

• Chungnam

  • AsanDMI
  • DangjinMyeoncheon Factory

• Gwangju

  • GwangjuSejung Tube Co.,Ltd.

• Eumseong

  • EumseongDuckyoung Tech Co., Ltd.,

• Gyeongbuk

  • YeongcheonYeongcheon Factory

• Gyeongnam

  • GyeongnamHaman Factory