TCVN 4947-1989 Pneumatic system for mechanical engineering Check valves Test methods《机械工程的气动系统 止回阀 试验方法》.pdf

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STAS 901-1990 Hot rolled steel STEEL SHEETS FOR MECHANICAL ENGINEERING ROLLED ON DIS- CONTINUOS MILLS《热轧钢／机械工程用钢板，间歇磨上轧制》.pdf

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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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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