Means for securing casing in a well,申请号US19380194994-传众专利搜索

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发明名称	Means for securing casing in a well
摘要
申请公布号	US2228555(A)	申请公布日期	1941.01.14
申请号	US19380194994	申请日期	1938.03.10
申请人	BARKER ERNEST L	发明人	BARKER ERNEST L.
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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