About KOMAZAKI SHIN'ICHI
About TANAKA YOSHITAKA
About KONO YUTAKA
About NAKAYAMA TAKENORI
About 神戸製鋼所 材料研
About HOSOGI TETSURO
About コベルコマテリアル銅管
About ISHIBASHI AKIHIKO
About コベルコマテリアル銅管
About Carbonic Acid
About C1201
About Corrosion prevention
About 炭酸
About 人工
About 地下水
About 溶液
About 銅
About 孔食
About 皮膜