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skirting
In pillar extraction, it refers to a stall or roadway working a slice or lift of coal along the side of a pillar.
- 词性: noun
- 行业/领域: 采矿
- 类别 一般矿业; Mineral mining
- Government Agency: USBM
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创建者
- ed.young
- 100% positive feedback
(Milwaukee, United States)