Underreamer,申请号US19350036569-传众专利搜索

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发明名称	Underreamer
摘要
申请公布号	US2031353(A)	申请公布日期	1936.02.18
申请号	US19350036569	申请日期	1935.08.16
申请人	ELLIS WOODRUFF HARVEY	发明人	WOODRUFF HARVEY ELLIS
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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