Ile-iṣẹ Idanwo Awọn ohun elo Irin ti Orilẹ-ede
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Ẹka Yantai, Ile-iṣẹ 52 ti Ẹgbẹ Awọn ile-iṣẹ China
Wuhan Iron ati Irin Group Technology Center ayewo
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Ile-iwe ti Kemistri ati Imọ-ẹrọ Kemikali, Ile-ẹkọ giga Shandong
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Shandong Metallurgical Ọja Abojuto Didara ati Ibusọ Ayewo
Jinan Iron ati Irin Group Corporation