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遵照伟大领袖毛主席“独立自主,自力更生”和“开发矿业”的教导,为加快地质勘探和矿山生产建设速度,根据国家计委领导同志的指示,冶金部、一机部、燃化部、国家计委地质局,于1974年5月15日至25日在湖南锡矿山联合召开了坑道用人造金刚石钻头、钻机鉴定及人造金刚
In accordance with the teachings of Chairman Mao, the great leader, “independence, self-reliance” and “development of mining”, in order to speed up geological exploration and the pace of mine production and construction, according to the instructions of leading comrades of the State Planning Commission, the Ministry of Metallurgy, Ministry, State Planning Commission Geological Bureau, held in May 19, 1974 to 25 in Hunan tin mines with tunnel artificial diamond drill, rig identification and synthetic diamond