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发明名称
Circulating sub
摘要
申请公布号
GB0422444(D0)
申请公布日期
2004.11.10
申请号
GB20040022444
申请日期
2003.04.14
申请人
SPECIALISED PETROLEUM SERVICES GROUP LIMITED
发明人
分类号
E21B21/10;E21B34/12;E21B43/10
主分类号
E21B21/10
代理机构
代理人
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地址
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