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经营范围
发明名称
DOUBLE CORE DRILL STRING
摘要
申请公布号
SU977698(A1)
申请公布日期
1982.11.30
申请号
SU19813278312
申请日期
1981.04.22
申请人
URALSKOE PROIZV GEOLOGICHESKOE OBEDINENIE
发明人
LEVCHENKO NIKOLAJ S,SU;PEREVOZCHIKOV IGOR B,SU;STAKHEEV PETR I,SU
分类号
E21B25/10;(IPC1-7):E21B25/10
主分类号
E21B25/10
代理机构
代理人
主权项
地址
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