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Koji Sanbongi
The Research Institute of Mineral Dressing and Metallurgy, Tohoku University
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Masayasu Ohtani
The Research Institute of Mineral Dressing and Metallurgy, Tohoku University
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Yasuo Omori
The Research Institute of Mineral Dressing and Metallurgy, Tohoku University
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Hirobumi Inoué
The Research Institute of Mineral Dressing and Metallurgy, Tohoku University