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为贯彻毛主席“开发矿业”的伟大指示,使牙轮钻头能适应钻机生产的需要,赶超国外牙轮钻头的技术水平,一机部矿山局和冶金部科技司于1975年2月21日至27日在北京召开了牙轮钻头生产技术座谈会。参加座谈会的有一机、冶金系统的牙轮钻头生产和使用厂、矿、研究院、所共15个单位20多名代表。到会代表认真学习了中央文件,畅谈了大
In order to implement Chairman Mao’s “Great Development of Mining,” the great instructions to make roller cone drill to adapt to the needs of production to catch up with the technical level of foreign roller cone drill, a mechanized mines and the Ministry of Science and Technology Department of Metals in February 21, 1975 To 27 in Beijing held a cone bit production technology forum. Attending the symposium there is a machine, metallurgical system cone roller bit production and use of factories, mines, research institutes, a total of 15 units of more than 20 representatives. The delegates seriously studied the central documents and talked about the big ones