Rotary-disk underreamer,申请号US19270186895-传众专利搜索

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发明名称	Rotary-disk underreamer
摘要
申请公布号	US1758187(A)	申请公布日期	1930.05.13
申请号	US19270186895	申请日期	1927.04.27
申请人	HARRY C. BROWN;E. A. WILEY	发明人	BROWN JACOB S.
分类号	E21B10/12	主分类号	E21B10/12
代理机构		代理人
主权项
地址

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