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发明名称
Circulation tool
摘要
申请公布号
GB9904307(D0)
申请公布日期
1999.04.21
申请号
GB19990004307
申请日期
1999.02.25
申请人
SPECIALISED PETROLEUM SERVICES LIMITED
发明人
分类号
E21B21/10;E21B34/14;E21B37/00
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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