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经营范围
发明名称
DRILLING OF WELLS
摘要
申请公布号
GB8501643(D0)
申请公布日期
1985.02.27
申请号
GB19850001643
申请日期
1985.01.23
申请人
VARCO INTERNATIONAL LTD
发明人
分类号
E21B3/02;E21B19/02;E21B19/16
主分类号
E21B3/02
代理机构
代理人
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地址
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