Main Sales and Purchase(The Japanese syllabary order)
 Itochu Metals Co.,Ltd.
 Inoue Calcium Co.,Ltd.
 Ohgitani Co.,Ltd
 Sakai Chemical Industry Co.,Ltd.
 Mitsubishi Shindoh Co.,Ltd.
 Sumitomo Metal Mining Co.,Ltd.
 Tannan Chemical Industries Co.,Ltd.
 Tayca Corporation
 JX METALS TRADING CO., LTD.
 Futamura Chemical Industries Co.,Ltd.
 MITSUI KINZOKU
 Mitsubishi Chemical Corporation
 Mitsubishi Materials Corporation
 Minabe Kakou Co.,Ltd.

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