MUD SAVER VALVE WITH REPLACEABLE INNER SLEEVE,申请号GB19890024378-传众专利搜索

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发明名称	MUD SAVER VALVE WITH REPLACEABLE INNER SLEEVE
摘要
申请公布号	GB2227771(B)	申请公布日期	1992.10.07
申请号	GB19890024378	申请日期	1989.10.30
申请人	* DRILEX SYSTEMS INC	发明人	THOMAS F * BAILEY;RAYMOND A * TODD,JR.
分类号	E21B21/10;E21B34/06	主分类号	E21B21/10
代理机构		代理人
主权项
地址

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