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							Manabu ITO
														
									R & D Dept., Benkan Corp.
							 
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							Fumiaki AONO
														
									R & D Dept., Benkan Corp.
							 
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							Akiyoshi KOSUGE
														
									R & D Dept., Benkan Corp.
							 
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							Ryouji HIRAYAMA
														
									R & D Dept., Hashimoto Chemical Corp.
							 
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							Hirohisa KIKUYAMA
														
									R & D Dept., Hashimoto Chemical Corp.
							 
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							Seiji KAMASAKI
														
									Fac. of Eng., Tokyo Metropolitan Univ.