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〈美国专利〉6,480,963Tachibana,et al.November 12,2002〈发明人〉Tachibana;Hirotaka(Kawasaki,JP);Urita;Seiichi(Kawasaki,JP);Kotani;Seigo(Kawasaki,JP);Hayashi;Takehiko(Kawasaki,JP)〈代理人〉Fujitsu Limited(Kawasaki,JP)〈公开号〉225212〈公开日〉