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Hiroshi NAGAISHI
Government Industrial Development Laboratory, Hokkaido
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Masahide SASAKI
Government Industrial Development Laboratory, Hokkaido
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Kiyoshi IDOGAWA
Government Industrial Development Laboratory, Hokkaido
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Takeshi KOTANIGAWA
Government Industrial Development Laboratory, Hokkaido
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Yosuke MAEKAWA
Government Industrial Development Laboratory, Hokkaido
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Yasuo OTAKA
Sumitomo Coal Mining Co: Ltd
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Kiyofumi OKADA
Coal Mining Research Centre, Japan