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发明名称
EARTH DRILL
摘要
申请公布号
JPH06158974(A)
申请公布日期
1994.06.07
申请号
JP19920332522
申请日期
1992.11.18
申请人
HITACHI CONSTR MACH CO LTD
发明人
AJIRO SHUICHI;TAKEDA KOJI
分类号
E21B11/00;(IPC1-7):E21B11/00
主分类号
E21B11/00
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代理人
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