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Shigekazu Sakabe
The Central Research Laboratory Mitsubishi Electric Corporation, Amagasaki, Hyogo, Japan.
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Tatsuei Nomura
The Central Research Laboratory Mitsubishi Electric Corporation, Amagasaki, Hyogo, Japan.
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Masatami Iwamoto
The Central Research Laboratory Mitsubishi Electric Corporation, Amagasaki, Hyogo, Japan.