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发明名称
DRILL BIT
摘要
申请公布号
PL151755(B1)
申请公布日期
1990.10.31
申请号
PL19860258318
申请日期
1986.03.07
申请人
发明人
分类号
E21B10/16;(IPC1-7):E21B10/16
主分类号
E21B10/16
代理机构
代理人
主权项
地址
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