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发明名称
UNDERWATER EXCAVATING DEVICE FOR OIL WELL OR GAS WELL
摘要
申请公布号
JPS5269801(A)
申请公布日期
1977.06.10
申请号
JP19760146045
申请日期
1976.12.03
申请人
UIRUSON UORUTON ENG LTD
发明人
JIYOFURII EEKU DAUNZU
分类号
E21B7/128;E21B43/017
主分类号
E21B7/128
代理机构
代理人
主权项
地址
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