Automatic feed device for rotary drill bits,申请号US19280258170-传众专利搜索

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发明名称	Automatic feed device for rotary drill bits
摘要
申请公布号	US1785086(A)	申请公布日期	1930.12.16
申请号	US19280258170	申请日期	1928.03.01
申请人	LEROY G. GATES	发明人	HAUK JOHN W.
分类号	E21B17/07	主分类号	E21B17/07
代理机构		代理人
主权项
地址

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