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发明名称
Purging means for purging upwards in ring spacing between drill pipe and bore hole wall
摘要
申请公布号
GB2321484(A)
申请公布日期
1998.07.29
申请号
GB19980007457
申请日期
1996.10.15
申请人
MAGNE * HOVDEN
发明人
MAGNE * HOVDEN
分类号
E21B21/10;E21B34/12;E21B41/00;(IPC1-7):E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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