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Kammerpfeilerbruchbau m
矿业 board-and-pillar; bord-and-pillar (method); bord-and-wall; brown panel system; chequer-board system; Lancashire bord-and-pillar system; Lancashire method; modified room-and-pillar working; narrow working; North Staffordshire method; pillar-and-breast (method); post-and-stall (method); rock-chute mining; room system (with caving); Warwickshire method
Kammerpfeilerbruchbau
: 5 短语, 1 学科
矿业5

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