Drill bit loosener,申请号US19450634610-传众专利搜索

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发明名称	Drill bit loosener
摘要
申请公布号	US2458951(A)	申请公布日期	1949.01.11
申请号	US19450634610	申请日期	1945.12.12
申请人	MALINAK SAMUEL H	发明人	MALINAK SAMUEL H.
分类号	E21B19/18	主分类号	E21B19/18
代理机构		代理人
主权项
地址

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