Drive lug for pilot bit and earth boring augers,申请号US19540468620-传众专利搜索

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发明名称	Drive lug for pilot bit and earth boring augers
摘要
申请公布号	US2870995(A)	申请公布日期	1959.01.27
申请号	US19540468620	申请日期	1954.11.15
申请人	PETERSEN GERALD A M	发明人	PETERSEN GERALD A. M.
分类号	E21B10/44;E21B10/60;E21B17/046	主分类号	E21B10/44
代理机构		代理人
主权项
地址

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