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Hg140 Rectangular ERW Pipe High-Frequency Welding / Tube Mill Machine Price/Straight Seam Welded Pipe, Find Details and Price about ERW Tube Mill ERW Pipe Mill from Hg140 Rectangular ERW Pipe High-Frequency Welding / Tube Mill Machine Price/Straight Seam Welded Pipe - Shijiazhuang Tengdi Machinery Co., Ltd.