Through surmounting solves the technology knotty problem of retrieving coal column of mining area with the system mechanization mining technique. By application in mining process the effect is better.
通过攻关，解决了综采工艺回收盘区煤柱的技术难题，经过在开采过程中的应用，效果良好。
Through surmounting solves the technology knotty problem of retrieving coal column of mining area with the system mechanization mining technique. By application in mining process the effect is better.
通过攻关，解决了综采工艺回收盘区煤柱的技术难题，经过在开采过程中的应用，效果良好。
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