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发明名称
EXPANDED HOLE DRILLING HEAD
摘要
申请公布号
JPH0960467(A)
申请公布日期
1997.03.04
申请号
JP19950216906
申请日期
1995.08.25
申请人
NIPPON BEESU KK
发明人
KOMAZAWA KAZUO
分类号
E21B10/32;(IPC1-7):E21B10/32
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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