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发明名称
DRILLING DEVICE AND INNER EXCAVATION
摘要
申请公布号
JPH09279972(A)
申请公布日期
1997.10.28
申请号
JP19960088438
申请日期
1996.04.10
申请人
GIKEN SEISAKUSHO CO LTD
发明人
KITAMURA MORIO
分类号
E21B3/02;E02D7/00;E21B7/00;(IPC1-7):E21B3/02
主分类号
E21B3/02
代理机构
代理人
主权项
地址
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