China National Standards

China Tungsten carbide balls Industry Standards English PDF List

  •  China "Tungsten carbide balls" Industry Standards English PDF List:
    • Standard  Code Standard Title Standard Class Order
    QB/T 4433-2012 Tungsten carbide balls for ball pen
    圆珠笔用碳化钨球珠    		 China Light Industry Standards
    Tungsten carbide balls
    English PDF

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