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Fumitake Itoh
The Research Institute for Iron, Steel and Other Metals, Tohoku University
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Masao Kuroha
The Research Institute for Iron, Steel and Other Metals, Tohoku University
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Kenzo Kai
The Research Institute for Iron, Steel and Other Metals, Tohoku University
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Sakae Takeuchi
The Research Institute for Iron, Steel and Other Metals, Tohoku University