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在毛主席“破除迷信,解放思想”的伟大教导指引下,江西下垄钨矿和冶金部长沙矿山研究院共同努力,试制天井牙轮钻机获得成功。这台适用于地下开采矿山天井掘
Under the guidance of Chairman Mao’s great teaching on “escaping superstition and emancipating the mind”, the Jiangxi Xiajiu Mines and Metallurgical Department’s Changsha Research Institute of Minerals worked together to try the success of the trial of the patio cone drill. This is suitable for underground mining mines patio digging