Обратный клапан дл обсадной колонны скважины,申请号RU20020125277U-传众专利搜索

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发明名称	Обратный клапан дл обсадной колонны скважины
摘要
申请公布号	RU28891(U1)	申请公布日期	2003.04.20
申请号	RU20020125277U	申请日期	2002.09.27
申请人	Сафин Велир Ахатович	发明人	Сафин В.А.;Момот В.И.;Ермаков О.Н.;Куреннов А.И.
分类号	E21B33/14	主分类号	E21B33/14
代理机构		代理人
主权项
地址

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