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Kôki Ikeda
The Research Institute for Iron, Steel and Other Metals, Tôhoku University
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Takurô Nakamichi
The Research Institute for Iron, Steel and Other Metals, Tôhoku University
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Tutomu Yamada
The Research Institute for Iron, Steel and Other Metals, Tôhoku University
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Mikio Yamamoto
The Research Institute for Iron, Steel and Other Metals, Tôhoku University