1.  

    POONG SAN

    Incheon   324-6 Hyosong-dong Kyeyang-ku Incheon

  2.  

    DONG HAE CHEMICAL IND. CO. Ltd

    Gyeongbuk   492 Wolpo-ri Chongha-myon Puk-ku Pohang-shi Gyeongbuk

  3.  
  4.  
  5.  

    KUEM HWEA CO. Ltd

    Chungnam   636-3 Ssangb-ri Puyo-up Puyo-kun Chungnam

  6.  

    AN YANG JANGSUK

    Seoul   25 2gaChungjong-ro Sodaemun-ku Seoul

  7.  

    DONGWON

    Gangwon   147-3 Sabuk-ri Sabuk-up Chongson-kun Gangwon

  8.  
  9.  
  10.  

    TAELIM CO. LTD

    Gyeongbuk   520-1 Chongnim-dong Nam-ku Pohang-shi Gyeongbuk

  11.  
  12.  

    PYUNG GOK IND. CO. Ltd

    Chungbuk   497 Upnae-ri Umsong-up Umsong-kun Chungbuk

  13.  
  14.  
  15.  

    KOREA SILICA LIMITED.

    Gangwon   783-1 Mungok-ri Puk-myon Yongwol-kun Gangwon

  16.  

    KYUNG-DONG CO. Ltd

    Gangwon   1-1 Sangdo-ri Togye-up Samchok-shi Gangwon

  17.  

    DONG CHANG IND. CO.

    Gyeongbuk   1126-1 Oeo-ri Masong-myon Mungyong-shi Gyeongbuk

  18.  
  19.  

    JINBANG STEEL CO. LTD

    Gyeongbuk   605 Ho-dong Nam-ku Pohang-shi Gyeongbuk

  20.  

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