Oil well filter,申请号US19420451720-传众专利搜索

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发明名称	Oil well filter
摘要
申请公布号	US2357589(A)	申请公布日期	1944.09.05
申请号	US19420451720	申请日期	1942.07.21
申请人	E. I. DU PONT DE NEMOURS & COMPANY	发明人	HOLMES HARRISON H.;LAWSON WALTER E.
分类号	E21B43/04	主分类号	E21B43/04
代理机构		代理人
主权项
地址

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