China National Standards

China 1：Rotary GB Standards List

  •  China "1：Rotary" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 22512.1-2012 Petroleum and natural gas industries - Rotary drilling equipment - Part 1：Rotary drill stem elements
    石油天然气工业 旋转钻井设备 第1部分：旋转钻柱构件    		 China National Standards
    1：Rotary
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