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K\={o} Yasuk\={o}chi
Department of Physics, College of Science and Engineering, Nihon University
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Takeshi Ogasahara
Department of Physics, College of Science and Engineering, Nihon University
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Nobumitsu Usui
Department of Physics, College of Science and Engineering, Nihon University
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Shintar\={o} Ushio
Research Laboratory of Oki Electric Industry Co., Ltd.