Underreamer,申请号US19340725603-传众专利搜索

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发明名称	Underreamer
摘要
申请公布号	US2012775(A)	申请公布日期	1935.08.27
申请号	US19340725603	申请日期	1934.05.14
申请人	C. E. GLAMANN	发明人	ROE EMMETT J.
分类号	E21B10/32	主分类号	E21B10/32
代理机构		代理人
主权项
地址

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