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2011-12-20
JB/T 8824.3-2012
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2012-05-24
JB/T 8364.3-2010
60°圆锥管螺纹刀具 第3部分:60°圆锥管螺纹丝锥 技术条件
Tools for taper pipe threads with 60°thread angle-Part 3:Taps for taper pipe threads with 60°thread angle-Technical specification