Plug insert bit for core drills,申请号US19480007811-传众专利搜索

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发明名称	Plug insert bit for core drills
摘要
申请公布号	US2543861(A)	申请公布日期	1951.03.06
申请号	US19480007811	申请日期	1948.02.12
申请人	MADER HARRY J	发明人	MADER HARRY J.
分类号	E21B10/04;E21B10/26;E21B10/48;E21B10/60;E21B10/62	主分类号	E21B10/04
代理机构		代理人
主权项
地址

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