About YAMADA YUTAKA
About 住友金属工業
About MORI AKIHISA
About 松下精工
About HATANAKA RYUICHI
About 住友金属工業
About ATSUMI TETSURO
About 松下精工
About NAKAO NOBUYUKI
About 松下精工
About copper pipe
About 冷温水
About Corrosion
About Air conditioning equipment in general
About 開放系
About 蓄熱槽
About 冷温水
About 空調機
About 銅管
About 孔食