Retractable core taking device,申请号US19400333549-传众专利搜索

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发明名称	Retractable core taking device
摘要
申请公布号	US2357907(A)	申请公布日期	1944.09.12
申请号	US19400333549	申请日期	1940.05.06
申请人	MORT L. CLOPTON	发明人	PHILLIPS RALPH A.
分类号	E21B25/02	主分类号	E21B25/02
代理机构		代理人
主权项
地址

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