Method and apparatus for drilling wells,申请号US19540464338-传众专利搜索

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发明名称	Method and apparatus for drilling wells
摘要
申请公布号	US2841366(A)	申请公布日期	1958.07.01
申请号	US19540464338	申请日期	1954.10.25
申请人	DUNN JOHN C	发明人	DUNN JOHN C.
分类号	E21B7/04	主分类号	E21B7/04
代理机构		代理人
主权项
地址

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