Rotation mechanism for rock drills,申请号US19290369346-传众专利搜索

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发明名称	Rotation mechanism for rock drills
摘要
申请公布号	US1773366(A)	申请公布日期	1930.08.19
申请号	US19290369346	申请日期	1929.06.08
申请人	INGERSOLL-RAND COMPANY	发明人	LEAR EARL B.
分类号	E21B6/06	主分类号	E21B6/06
代理机构		代理人
主权项
地址

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