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productive development
The headings and levels excavated in a coal seam, preparatory to opening out working faces. These drivages are planned to prove and render accessible the maximum area of coal for the minimum yardage of development work. The modern trend is to make inthe- seam development as productive as possible with the aid of machines.
- 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
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(Milwaukee, United States)