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Method for ventilation of mine workings
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Method of underground coal seam gasification
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Junction of mine workings
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Opening and preparation method for gently dipping coal seam
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Leakage relay
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Pulse optronic time relay
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Dynamic flip-flop
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Remote control device with zero protection
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Method for suspending and replacing balancing ropes of multi-rope hoisting installations
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Skip
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Installation for cleaning the sumps of vertical mine shafts
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Method of stripping and preparing gentry sloping coal seams
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