Apparatus for sealing a well casing,申请号US19870053985-传众专利搜索

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发明名称	Apparatus for sealing a well casing
摘要
申请公布号	USRE32831(E)	申请公布日期	1989.01.17
申请号	US19870053985	申请日期	1987.04.26
申请人		发明人
分类号	E21B33/12;E21B33/128;E21B33/129;E21B33/134	主分类号	E21B33/12
代理机构		代理人
主权项
地址

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