在毛主席无产阶级革命路线指引下,在各级党组织的正确领导和关怀下,我队从1974年 9月开始将上海砂轮厂和地科院勘探所协作试制的人造金刚石孕镶钻头、扩孔器应用于生产试验。国产人造金刚石钻头的试制成功是毛主席“独立自主、自力更生”方针的胜利。这说 Under the guidance of Chairman Mao’s proletarian revolutionary line and with the correct leadership and care of party organizations at all levels, our team started from September 1974 with artificial diamond impregnated drill bits co-produced by Shanghai Grinding Wheel Factory and the Exploration Institute of the Earth Science Institute, Reaming device used in production tests. The successful trial of the domestic synthetic diamond bit is the victory of Chairman Mao’s principle of “independence and self-reliance.” That said