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发明名称
Improvements relating to earth drilling equipment
摘要
申请公布号
GB946877(A)
申请公布日期
1964.01.15
申请号
GB19610010772
申请日期
1961.03.24
申请人
DENIS VAUGHAN BAGLOW
发明人
分类号
E21B21/01;E21B21/02
主分类号
E21B21/01
代理机构
代理人
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