Apparatus for drilling a borehole with a gaseous circulation medium,申请号US19660555101-传众专利搜索

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发明名称	Apparatus for drilling a borehole with a gaseous circulation medium
摘要
申请公布号	US3417830(A)	申请公布日期	1968.12.24
申请号	US19660555101	申请日期	1966.06.03
申请人	MOBIL OIL CORPORATION	发明人	NICHOLS DEAN P.
分类号	E21B10/60;E21B21/00;E21B21/16	主分类号	E21B10/60
代理机构		代理人
主权项
地址

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