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发明名称
DRILLING
摘要
申请公布号
GB8623080(D0)
申请公布日期
1986.10.29
申请号
GB19860023080
申请日期
1986.09.25
申请人
SLOMA, R M;ROBINSON, R E
发明人
分类号
E21B3/04;E21B7/02;E21B17/07
主分类号
E21B3/04
代理机构
代理人
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地址
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