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经营范围
发明名称
A HANGER
摘要
申请公布号
GB8901042(D0)
申请公布日期
1989.03.15
申请号
GB19890001042
申请日期
1989.01.18
申请人
NATIONAL OIL WELL (UK) LIMITED
发明人
分类号
E21B33/043
主分类号
E21B33/043
代理机构
代理人
主权项
地址
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