Concave multiple cutting edge rock drill bit and die,申请号US19550527349-传众专利搜索

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发明名称	Concave multiple cutting edge rock drill bit and die
摘要
申请公布号	US2863639(A)	申请公布日期	1958.12.09
申请号	US19550527349	申请日期	1955.08.09
申请人	LEO BREDESEN	发明人	BREDESEN LEO
分类号	E21B10/36	主分类号	E21B10/36
代理机构		代理人
主权项
地址

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