Design and Application of Multi-section Bundled Cordage Coring Drill

Release time:

2020-12-07

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Mechanics mechanism of pressure relief drilling for hole protection in soft coal seam

Yikuang Science and Technology | Heavy Snow Arrives, Cold Winter Begins

Mechanics mechanism of pressure relief drilling for hole protection in soft coal seam

Yikuang Science and Technology | Heavy Snow Arrives, Cold Winter Begins

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