Shaft bearing fluid seal for downhole drilling engines,申请号US19590810111-传众专利搜索

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发明名称	Shaft bearing fluid seal for downhole drilling engines
摘要
申请公布号	US3149685(A)	申请公布日期	1964.09.22
申请号	US19590810111	申请日期	1959.04.30
申请人	DRESSER INDUSTRIES, INC.	发明人	MITCHELL JOSEPH A.;WORKS MADDEN T.;JR. THOMAS E. TUCKER,
分类号	E21B4/02	主分类号	E21B4/02
代理机构		代理人
主权项
地址

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