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Kenichi Kikuchi
Department of Materials Engineering and Applied Chemistry, Mining College, Akita University
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Eiki Itoh
Department of Materials Engineering and Applied Chemistry, Mining College, Akita University
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Hiroshi Takahashi
Department of Materials Engineering and Applied Chemistry, Mining College, Akita University
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Takuo Sugawara
Department of Geoscience, Mining Engineering and Materials Processing, Mining College, Akita University