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发明名称
UNDERGROUND EXCAVATING METHOD AND DEVICE THEREFOR
摘要
申请公布号
JPH0813970(A)
申请公布日期
1996.01.16
申请号
JP19940145148
申请日期
1994.06.27
申请人
OTA TOMIO
发明人
OTA TOMIO
分类号
E21B7/20;(IPC1-7):E21B7/20
主分类号
E21B7/20
代理机构
代理人
主权项
地址
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