Inserted tooth rock drill,申请号US19490075983-传众专利搜索

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法人/股东/高管

发明名称	Inserted tooth rock drill
摘要
申请公布号	US2649284(A)	申请公布日期	1953.08.18
申请号	US19490075983	申请日期	1949.02.12
申请人	ARTHUR LETTS ORLANDO	发明人	LETTS ORLANDO ARTHUR
分类号	E21B17/04	主分类号	E21B17/04
代理机构		代理人
主权项
地址

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