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下面三篇文章系根据一九七二年四月至五月瑞典赴加拿大采矿考察团提出的一篇报告摘译的。——编者.瑞典井下采掘设备的发展情况一、瑞典平巷采掘凿岩设备的发
The following three articles are based on a report compiled by the Swedish mining delegation to Canada from April to May 1972. - Editor. Development of underground mining equipment in Sweden First, Sweden Lane excavation drilling equipment