China National Standards

China machine—Double GB Standards List

  •  China "machine—Double" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 41056-2021 Full face tunnel boring machine—Double shield hard rock tunnel boring machine
    全断面隧道掘进机 双护盾岩石隧道掘进机    		 China National Standards
    machine—Double
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