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Tooru HASEGAWA
Nagaoka Univ. of Tech. Graduate Course
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Shigeru NAGASAWA
Nagaoka Univ. of Tech. Graduate Course
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Yasushi FUKUZAWA
Nagaoka Univ. of Tech. Graduate Course
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Daishirou YAMAGUCHI
Katayama Steel Rule Die Co,Ltd
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Isamu KATAYAMA
Katayama Steel Rule Die Co,Ltd