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发明名称
CASING EXCAVATION BIT
摘要
申请公布号
JPH09112175(A)
申请公布日期
1997.04.28
申请号
JP19950297279
申请日期
1995.10.23
申请人
YAMAMOTO LOCK MACH KK;MARUWA GIKEN:KK
发明人
BOSHI MAMORU;FUKUI KAZUO
分类号
E21B10/40;(IPC1-7):E21B10/40
主分类号
E21B10/40
代理机构
代理人
主权项
地址
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