Oil well tool,申请号US19440540804-传众专利搜索

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发明名称	Oil well tool
摘要
申请公布号	US2427052(A)	申请公布日期	1947.09.09
申请号	US19440540804	申请日期	1944.06.17
申请人	GRANT OIL TOOL COMPANY	发明人	GRANT JOHN
分类号	E21B10/32	主分类号	E21B10/32
代理机构		代理人
主权项
地址

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