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发明名称
DUPLEX TUBE TYPE DRILL ROD MOUNTING AND DEMOUNTING DEVICE FOR CORE DRILL
摘要
申请公布号
JPH0434193(A)
申请公布日期
1992.02.05
申请号
JP19900138242
申请日期
1990.05.30
申请人
MITSUBISHI HEAVY IND LTD
发明人
KAWAMOTO KENJI
分类号
E21B19/24;E21B19/14
主分类号
E21B19/24
代理机构
代理人
主权项
地址
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