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为防止掘进迎头发生的冒顶事故,自1984年4月迄今,已在全局架棚巷道推广使用了前探支架,并规定槊棚巷道迎头不使用或使用不善者均按违章
In order to prevent head-on accident of heading accident, since April 1984, it has promoted the use of pre-exploration supports in the global shelter roadway and stipulated that all the roadway incumbent should not be used or not properly used according to the regulations