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concentration of mining works (1) |
double-unit longwall (1) |
mining (1) |
rock stresses (1) |
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technology (2) |
thing coal seam (2) |
concentration of mining works (1) |
double-unit longwall (1) |
mining (1) |
rock stresses (1) |
technical occupation (1) |
technology (2) |
thing coal seam (2) |