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1980年9月12日至11月底,我们配合国外引进的PROMEC TH286型四臂全液压钻孔台车技术,先后在广东乐昌三处张滩石场试验洞和坪石二处雷公尖隧道进口,采用φ42毫米
From September 12, 1980 to the end of November 1980, we cooperated with the PROMEC TH286 four-arm full-hydraulic drilling trolley technology imported from abroad and successively imported three tunnels at Zhangtan Rock Experimental Tailings and Pingshi No.3 mine in Lechang, Guangdong , Using φ42 mm