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一种利用普通雷管随机延时误差降振的束状炮孔掏槽爆破方法
Type of Patent:Invent
State of Patent:Authorized patents
Service Invention or Not:no
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一种动能弹装置及利用该装置疏通堵塞溜井的方法
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一种侧向崩矿炮孔结构以及侧向崩矿方法
