Protecting packer for casing heads,申请号US19480013496-传众专利搜索

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法人/股东/高管

发明名称	Protecting packer for casing heads
摘要
申请公布号	US2533059(A)	申请公布日期	1950.12.05
申请号	US19480013496	申请日期	1948.03.06
申请人	SHAFFER TOOL WORKS	发明人	SHAFFER DONALD U.
分类号	E21B33/04	主分类号	E21B33/04
代理机构		代理人
主权项
地址

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