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发明名称
DRILLING BOREHOLES
摘要
申请公布号
GB2139929(A)
申请公布日期
1984.11.21
申请号
GB19830034290
申请日期
1983.12.22
申请人
HORST * KLUNDER
发明人
MANFRED * ALBERS
分类号
E21B7/04;E21B7/06;E21B7/08;E21B17/20;E21B19/22;(IPC1-7):E21C5/00;F16L1/02
主分类号
E21B7/04
代理机构
代理人
主权项
地址
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