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China Shaped and round sea GB Standards Search Result

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GB/T 30829-2014
Shaped and round seamless steel tubes for oil derrick
石油井架用异型及圆形无缝钢管 - 中英文版
GB/T 25822-2010
Shaped and round seamless steel tubes for axle
车轴用异型及圆形无缝钢管 - 中英文版

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