China Hollow hexagonal dri GB Standards Search Result |
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GB/T 6481-2016 Hollow hexagonal drill rods with taperd connection for rock drilling 凿岩用锥体连接中空六角形钎杆 - 英文版 |
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GB/T 6481-2002 Hollow hexagonal drill rods with taperd connection for rock drilling 凿岩用锥体连接中空六角形钎杆 - 英文版 |
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