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发明名称
MULTISTAGE HOLE ENLARGING BIT
摘要
申请公布号
JPS6278393(A)
申请公布日期
1987.04.10
申请号
JP19850217615
申请日期
1985.09.30
申请人
KOKUDO BOSAI GIJUTSU KK
发明人
SHIN JIYUNSHIYOKU
分类号
E21B10/32
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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