roller snap thread gage 滚柱螺纹卡规 roller spot-and-seam welding machine 辊式点-缝焊机 roller suspension pipemaking machine 滚筒悬置式制管机 ..
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... rolled steel for welded structure焊接结构用轧制钢材 roller spot-and-seam welding machine辊式点缝焊机 roller welding轧焊 ...
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