Method and apparatus for drilling wells,申请号US19330701951-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	US2277989(A)	申请公布日期	1942.03.31
申请号	US19330701951	申请日期	1933.12.12
申请人	KINNEAR LELAND P	发明人	KINNEAR LELAND P.
分类号	E21B10/32;E21B10/66	主分类号	E21B10/32
代理机构		代理人
主权项
地址

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