Gas pumping amplification through hole drill pipe beneficial mining technology grooving drill pipe

Release time:

2021-07-23

Author:

Source:

Large hole drill pipe

Key words:

Large hole drill pipe gas drainage drill pipe beneficial mine technology

Come on, Zhengzhou! Come on, Henan!

Large hole drill pipe gas drainage drill pipe beneficial mine technology

Come on, Zhengzhou! Come on, Henan!

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