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经营范围
发明名称
Controlling an underground object
摘要
申请公布号
GB9904010(D0)
申请公布日期
1999.04.14
申请号
GB19990004010
申请日期
1999.02.22
申请人
发明人
分类号
E21B7/06
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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