Tianjin Ruijie Steel Pipe Co., Ltd. tuʻu 2,500 tola o faiaoga faitaua mumu spiral ssaw lalolagi i China Railway Group Limited i 2018, e tali ia lava moe te uiga o le faiaoga faitaua mumu maota. O le matagofie o le faitaua mumu 529-1660mm.
Feiloa'i
Tianjin Ruijie Steel Pipe Co., Ltd. tuʻu 2,500 tola o faiaoga faitaua mumu spiral ssaw lalolagi i China Railway Group Limited i 2018, e tali ia lava moe te uiga o le faiaoga faitaua mumu maota. O le matagofie o le faitaua mumu 529-1660mm.
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