Rotary drill bit,申请号US19230623600-传众专利搜索

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发明名称	Rotary drill bit
摘要
申请公布号	US1791186(A)	申请公布日期	1931.02.03
申请号	US19230623600	申请日期	1923.03.08
申请人	BLACK LESTER C	发明人	BLACK LESTER C.
分类号	E21B10/44	主分类号	E21B10/44
代理机构		代理人
主权项
地址

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