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发明名称
ROTARY DRILL BITS
摘要
申请公布号
GB8430291(D0)
申请公布日期
1985.01.09
申请号
GB19840030291
申请日期
1984.11.30
申请人
NL PETROLEUM PRODUCTS LTD
发明人
分类号
E21B10/56;E21B10/567
主分类号
E21B10/56
代理机构
代理人
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