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Rin SAKKURAI
Grad. Sch. of Agric. and Life Sci., The Univ. of Tokyo
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Mitsuo HIMENO
Oita Prefectural Forestry Experimental Station
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Takashi FUTAMOTO
Japan Forest Mechanization Society
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Toshio NITAMI
Grad. Sch. of Agric. and Life Sci., The Univ. of Tokyo
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Hiroshi KOBAYASHI
Grad. Sch. of Agric. and Life Sci., The Univ. of Tokyo