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美中贸易全国委员会露天采矿代表团,于今年六月份来华访问并进行技术交流期间,美国德雷塞工业公司(DresserIndustries Inc.)采矿服务与设备分部的工地工程经理道格拉斯·A·扬先生在作了题为《牙轮穿孔与爆破技术》的报告以后,在座谈讨论时,简单介绍了菲律宾的马尔铜矿在两年前曾用一台 B-E40R 型牙轮钻机穿凿300
During a visit to China and exchange of technology during the visit to China in June this year, an open-cast mining delegation from the China-US Trade Committee, Mr. Douglas A. Yang, site engineering manager of the mining services and equipment division of Dresser Industries Inc., After a report entitled “Tornado Perforation and Blasting Technology”, during the discussion, a brief account of the Maltese copper mine in the Philippines was drilled 300 years ago using a B-E40R-type cone drill