Safety rope socket for well tubes,申请号US19520283814-传众专利搜索

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发明名称	Safety rope socket for well tubes
摘要
申请公布号	US2639893(A)	申请公布日期	1953.05.26
申请号	US19520283814	申请日期	1952.04.23
申请人	PIGOTT CHARLES R	发明人	PIGOTT CHARLES R.
分类号	E21B17/02;E21B17/06	主分类号	E21B17/02
代理机构		代理人
主权项
地址

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