Earth augers of the trip type,申请号US19550516228-传众专利搜索

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发明名称	Earth augers of the trip type
摘要
申请公布号	US2831658(A)	申请公布日期	1958.04.22
申请号	US19550516228	申请日期	1955.06.17
申请人	A. B. CHANCE COMPANY	发明人	SULLIVAN ROSS JOSEPH;SUMMERFIELD RALPH
分类号	E21B11/00;E21B11/04	主分类号	E21B11/00
代理机构		代理人
主权项
地址

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