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介绍了苏联全国各地所使用的各种先进麻花钻头结构。——编者 1964年10月8日至10日,值麻花钻生产一百周年之际,在维尔纽斯召开了全苏麻花钻会
The various advanced twist drill bits used throughout the country were introduced. - Editor On the occasion of the centennial anniversary of the production of twist drills from October 8 to October 1964, the All-Burma Drill Club was held in Vilnius