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发明名称
WELL EXCAVATOR
摘要
申请公布号
JPS55136390(A)
申请公布日期
1980.10.24
申请号
JP19790042853
申请日期
1979.04.09
申请人
CHINETSU GIJUTSU KAIHATSU KK
发明人
KOSHIYOU GENJI
分类号
E21B19/15;E21B19/00
主分类号
E21B19/15
代理机构
代理人
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地址
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