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2023
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Invention
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Plugging structure and system for drainage holes in gas tunnel. A plugging structure for drainage... |
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Invention
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Coal uncovering method for zero-clearance coal seam group of gas tunnel. The present application ... |
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Invention
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Method for arranging discharging holes in zero-distance multi-coal-seam group in gas tunnel. The ... |
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Invention
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Isolation protection system for safe operation of gas tunnel. An isolation protection system for ... |
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Invention
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Construction method for gas partition system of gas outburst tunnel. A construction method for a ... |
