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| pillar-and-board method; honeycomb method; honeycomb system; open-end method (с выемкой открытыми заходками); open-end system (с выемкой открытыми заходками); stoop-and-room; stoop-and-thirl | |||
| pillar-and-hard system | |||
| система разработки короткими столбами: 4 phrases in 1 subject |
| Mining | 4 |
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