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发明名称
ROTARY DRILL BIT
摘要
申请公布号
GB2095724(A)
申请公布日期
1982.10.06
申请号
GB19820005320
申请日期
1982.02.23
申请人
CHRISTENSEN INC
发明人
分类号
E21B10/42;E21B10/43;E21B10/46;(IPC1-7):E21B10/46
主分类号
E21B10/42
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代理人
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