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Mechanics
containing
心 石
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偏心金刚石钻头
off-centered diamond bit
石油中心工具公司
Oil Center Tool Company
金刚石取心系统【钻具】
diamond coring system
金刚石取心钻头
diamond core bit
金刚石取心钻机制造商协会
Diamond Core Drill Manufacturers Association
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