煤矿矿井 meaning in English

coal mine

Code for design of chambers around pitbottom of coal mine
煤矿矿井井底车场硐室设计规范
Discussion on shaft gas grade classification
煤矿矿井瓦斯等级划分探析
Code for design of inelined shaft and chambers of coal mine
煤矿矿井斜井井筒及硐室设计规范
Code for design of pitbottom of coal mine
煤矿矿井井底车场设计规范
Practical application in technological transformation peigou mine
裴沟煤矿矿井技术改造的探索

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