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Katsuya Yamauchi
Kyushu Institute of Design, 4-9-1, Shiobaru, Minami-ku, Fukuoka, 815-8540 Japan
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Yasunao Kai
Nippon Tungsten Inc., 3173-2, Sonobe, Kiyama-cho, Miyaki-gun, Saga, 841-0203 Japan
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Shin-ichiro Iwamiya
Kyushu Institute of Design, 4-9-1, Shiobaru, Minami-ku, Fukuoka, 815-8540 Japan