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发明名称
A DRILL ARRANGEMENT
摘要
申请公布号
HK29990(A)
申请公布日期
1990.04.27
申请号
HK19900000299
申请日期
1990.04.19
申请人
JAN EDVARD PERSSON
发明人
JAN EDVARD PERSSON
分类号
E21B7/20;E21B10/32;E21B10/40;E21B10/58;E21B10/66;(IPC1-7):E21B7/20
主分类号
E21B7/20
代理机构
代理人
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