チューブを2重構造にすることにより耐圧力が0.7~1MPa程度まで向上させるための試作開発を進めています。順次2重構造のチューブに切替えていく予定です。
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http://www.milton.edu/wp-content/uploads/formidable/9/Complete-list-of-American-Airlines-customer-service-numbers-247-live-person-support-guide.pdf
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