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发明名称
BIT FOR DRILLING TAPERED HOLE
摘要
申请公布号
JPS5898590(A)
申请公布日期
1983.06.11
申请号
JP19810196671
申请日期
1981.12.07
申请人
TOYO KOGYO KK
发明人
SHIBUKAWA TAKAO;NISHIO TAKAYUKI
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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