Mast for drilling oil wells and the like,申请号US19380224846-传众专利搜索

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发明名称	Mast for drilling oil wells and the like
摘要
申请公布号	US2219110(A)	申请公布日期	1940.10.22
申请号	US19380224846	申请日期	1938.08.15
申请人	PERRY A. THAYER;A. J. BOUNDY	发明人	MILLER DEE
分类号	E21B15/00	主分类号	E21B15/00
代理机构		代理人
主权项
地址

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