Earth boring drill,申请号US19550549969-传众专利搜索

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发明名称	Earth boring drill
摘要
申请公布号	US2901223(A)	申请公布日期	1959.08.25
申请号	US19550549969	申请日期	1955.11.30
申请人	HUGHES TOOL COMPANY	发明人	SCOTT FLOYD L.
分类号	E21B10/08;E21B10/18	主分类号	E21B10/08
代理机构		代理人
主权项
地址

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