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据日本《煤矿技术》杂志1993年第二期报道,住友煤矿为防止巷道掘进放炮时抛出的矸石击破局扇风筒,放炮时在风筒前悬挂一块带有金属护
According to the Japanese “Coal Mine Technology” magazine in 1993 second issue of reports, Sumitomo Mine Road to prevent blasting thrown thrown fan blasting fan, shot blasting in front of a hanger with a metal guard