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发明名称
CROSS-TYPE DRILL BIT
摘要
申请公布号
PL116140(B1)
申请公布日期
1981.05.30
申请号
PL19780205810
申请日期
1978.04.03
申请人
发明人
分类号
E21B;E21B10/18;(IPC1-7):E21B10/18
主分类号
E21B
代理机构
代理人
主权项
地址
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