DRILLSTRING CHECK VALVE,申请号SU19874384546-传众专利搜索

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发明名称	DRILLSTRING CHECK VALVE
摘要
申请公布号	SU1652515(A1)	申请公布日期	1991.05.30
申请号	SU19874384546	申请日期	1987.12.28
申请人	POPOV IVAN,SU;SPIVAKOVSKIJ YURIJ,SU;PLODUKHIN YURIJ P,SU;ORLIKOVSKIJ ALEKSANDR N,SU	发明人	POPOV IVAN I,SU;SPIVAKOVSKIJ YURIJ I,SU;PLODUKHIN YURIJ P,SU;ORLIKOVSKIJ ALEKSANDR N,SU
分类号	E21B34/06	主分类号	E21B34/06
代理机构		代理人
主权项
地址

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