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发明名称
DRILLING BIT
摘要
申请公布号
JPH11303561(A)
申请公布日期
1999.11.02
申请号
JP19980129615
申请日期
1998.04.22
申请人
TOYO KIKAKU KK
发明人
NAKANISHI YASUTAKA
分类号
E21B10/38;(IPC1-7):E21B10/38
主分类号
E21B10/38
代理机构
代理人
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地址
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