CSN 13 7700-1960 Screwed pipe joint non-soldered used in mechanical engineering Summary《机械工程用非焊接直螺纹套管连接头 摘要》.pdf

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CSN 13 7705-1960 Screwed pipe joints nonsoldered used in mechanical engineering Technical delivery code《机械工程用非焊接直螺纹套管连接头 技术交付代码》.pdf

DIN 7753-1-1988 Endless narrow V-belts for mechanical engineering purposes dimensions《机械工程用环形窄三角皮带 第1部分 尺寸》.pdf

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