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文内叙述了苏联地质保矿部中央设计局于1960年顺利完成工业试验的- 300A型万能钻探装置。-300A型装置用金刚石钻进深度达300米,硬质合金和钻粒钻进深
The text describes the successful commissioning of the industrial test by the Central Design Bureau of the Department of Geology and Mineral Resources of the Soviet Union in 1960 - a 300A universal drilling rig. -300A type device diamond drilling depth of 300 meters, cemented carbide and drill into the deep