China National Standards

China Rock drilling Rotary GB Standards List

  •  China "Rock drilling Rotary" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 20704-2006 Rock drilling - Rotary drill-rods and rotary drill-bits for dry drilling - Connecting dimensions
    岩石钻孔 干式钻杆和钻头 连接尺寸    		 China National Standards
    Rock drilling Rotary
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