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发明名称
APPARATUS FOR FORMING BOREHOLES
摘要
申请公布号
GB1527343(A)
申请公布日期
1978.10.04
申请号
GB19770010441
申请日期
1977.03.11
申请人
SCHMIDT P
发明人
分类号
E21B7/26;E21B4/00;E21B7/20;E21B17/02;E21B17/04;E21B23/00;(IPC1-7):E02D7/12
主分类号
E21B7/26
代理机构
代理人
主权项
地址
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