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由南京战斗机械厂和长沙矿山研究院联合研制的YGZ 70凿岩机,通过工业试验,证明样机性能达到设计要求,并于1978年11月由
By the Nanjing Combat Machinery Factory and Changsha Institute of Mining jointly developed YGZ 70 rock drill, through industrial tests to prove that the prototype performance to meet the design requirements, and in November 1978 by the