Report - 下水道土木工事共通仕様 書 - Sendai...JIS G 3455(高圧配管用炭素鋼鋼管) JIS G 3456(高温配管用炭素鋼鋼管 ) JIS G 3457(配管用アーク溶接炭素鋼鋼管)

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