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发明名称
Improved dual bore riser
摘要
申请公布号
GB9505129(D0)
申请公布日期
1995.05.03
申请号
GB19950005129
申请日期
1995.03.14
申请人
EXPRO NORTH SEA LIMITED
发明人
分类号
E21B17/01;E21B19/22
主分类号
E21B17/01
代理机构
代理人
主权项
地址
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