Spring loaded earth drill,申请号US19540406030-传众专利搜索

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发明名称	Spring loaded earth drill
摘要
申请公布号	US2873950(A)	申请公布日期	1959.02.17
申请号	US19540406030	申请日期	1954.01.25
申请人	KANDLE CHARLES W	发明人	KANDLE CHARLES W.
分类号	E21B4/18;E21B7/00	主分类号	E21B4/18
代理机构		代理人
主权项
地址

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