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1985年元月美国S&M工程承包公司和墨西哥沃布腊斯隧道工程公司共同与墨西哥奥特兰矿业公司(Minera Autlan)签订了一项合同,承包该公司所属一个矿山的一条平峒掘进工程。该平峒直径为3.8米、长
In January 1985, S & M Contracting Company of the United States and Warbler Tunnel Engineering Corporation of Mexico signed a contract with Minera Autlan Mexico to contract a flat excavation at a mine owned by the company. The flat 峒 diameter of 3.8 meters long