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1963年,杜尔综合课题研究队为了确定小颗粒金刚石钻头的机械钻速与转数和单位压力的关系曾在费思吉瓦尔矿床进行了研究工作。
In 1963, the Dole Integrated Research Task Force conducted a study on the Faust Giar deposit in order to determine the relationship between ROP and RPM and unit pressure for small particle diamond drill bits.