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发明名称
METHOD AND DEVICE FOR DRILLING LARGE-BORE VERTICAL HOLE
摘要
申请公布号
JPH10331562(A)
申请公布日期
1998.12.15
申请号
JP19970143768
申请日期
1997.06.02
申请人
TOYO LOCK SOIL KK
发明人
TAMAKI MORIO
分类号
E21B7/00;E21B7/20;(IPC1-7):E21B7/20
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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