Expanding hole enlarger or underreamer for deep wells,申请号US19500196499-传众专利搜索

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发明名称	Expanding hole enlarger or underreamer for deep wells
摘要
申请公布号	US2699921(A)	申请公布日期	1955.01.18
申请号	US19500196499	申请日期	1950.11.18
申请人	REGAN FORGE & ENGINEERING CO.	发明人	GARRISON MARION A.
分类号	E21B10/34	主分类号	E21B10/34
代理机构		代理人
主权项
地址

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