Locking device for core barrels and the like,申请号US19470778914-传众专利搜索

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发明名称	Locking device for core barrels and the like
摘要
申请公布号	US2521886(A)	申请公布日期	1950.09.12
申请号	US19470778914	申请日期	1947.10.09
申请人	WALKER JR JOHN MICHAEL	发明人	JR. JOHN MICHAEL WALKER,
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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