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经营范围
发明名称
An orientation device particularly for a drilling tool or a well
摘要
申请公布号
GB9818014(D0)
申请公布日期
1998.10.14
申请号
GB19980018014
申请日期
1997.02.05
申请人
BAKKE OIL TOOLS A/S
发明人
分类号
E21B7/06;E21B7/08;E21B23/00
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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