A mud saver valve sub,申请号GB19860009187-传众专利搜索

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发明名称	A mud saver valve sub
摘要
申请公布号	GB2189276(A)	申请公布日期	1987.10.21
申请号	GB19860009187	申请日期	1986.04.15
申请人	JEFFERY A * REDDOCH	发明人	JEFFERY A * REDDOCH
分类号	E21B21/10;(IPC1-7):E21B17/00	主分类号	E21B21/10
代理机构		代理人
主权项
地址

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