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发明名称
DRILLING
摘要
申请公布号
GB8414019(D0)
申请公布日期
1984.07.04
申请号
GB19840014019
申请日期
1984.06.01
申请人
SLOMA, R M
发明人
分类号
E21B7/02;E21B15/00;(IPC1-7):E21B7/02
主分类号
E21B7/02
代理机构
代理人
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