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发明名称
DRILL STRING CHECK VALVE
摘要
申请公布号
SU791909(A1)
申请公布日期
1980.12.30
申请号
SU19782594242
申请日期
1978.03.24
申请人
KARANDA SERGEJ ,SU;KARANDA IVAN M,SU
发明人
KARANDA SERGEJ ,SU;KARANDA IVAN M,SU
分类号
E21B17/00;(IPC1-7):E21B17/00
主分类号
E21B17/00
代理机构
代理人
主权项
地址
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