The shortwall ladder prop mining method namely strip extraction has been more extensively applied currently in small coal mine of Shaanxi province.
短壁刀柱
煤法即条带开,
在陕西省小煤矿开中较广泛应用。
The shortwall ladder prop mining method namely strip extraction has been more extensively applied currently in small coal mine of Shaanxi province.
短壁刀柱煤法即条带开,在陕西省小煤矿开中较广泛应用。
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