Large diameter earth drill,申请号US19600019730-传众专利搜索

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发明名称	Large diameter earth drill
摘要
申请公布号	US3092190(A)	申请公布日期	1963.06.04
申请号	US19600019730	申请日期	1960.04.04
申请人	CHARLES GRUERE	发明人	GRUERE CHARLES
分类号	E21B7/00;E21B10/44	主分类号	E21B7/00
代理机构		代理人
主权项
地址

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