GB T 17241.4-1998 Hubbed slip-on-welding and hubbed socket welding cast iron pipe flanges《带颈平焊和带颈承插焊铸铁管法兰》.pdf

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HB 6713-1993 轻型燃气轮机凸面带颈承插焊钢制管法兰.pdf

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HG 21530-1995 带颈平焊法兰手孔.pdf

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