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经营范围
发明名称
DOUBLE DRILING STRING
摘要
申请公布号
SU644937(A1)
申请公布日期
1979.01.30
申请号
SU19752148079
申请日期
1975.06.25
申请人
GEOLOGOPOISKOVAYA KONTORA TRESTA "TATNEFTEGAZRAVEDKA"
发明人
SEN PETR G,SU;MAZITOV MUKATDAS M,SU
分类号
E21B25/00;(IPC1-7):E21B25/00
主分类号
E21B25/00
代理机构
代理人
主权项
地址
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