China National Standards

China machine—Open GB Standards List

  •  China "machine—Open" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 34652-2017 Full face tunnel boring machine—Open type hard rock tunnel boring machine
    全断面隧道掘进机 敞开式岩石隧道掘进机    		 China National Standards
    machine—Open
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