Apparatus for well drilling,申请号US19540445780-传众专利搜索

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发明名称	Apparatus for well drilling
摘要
申请公布号	US2877984(A)	申请公布日期	1959.03.17
申请号	US19540445780	申请日期	1954.07.26
申请人	CAUSEY OTIS A	发明人	CAUSEY OTIS A.
分类号	E21B11/00	主分类号	E21B11/00
代理机构		代理人
主权项
地址

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