Pressure control means for drilling apparatus,申请号US19380198484-传众专利搜索

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发明名称	Pressure control means for drilling apparatus
摘要
申请公布号	US2213504(A)	申请公布日期	1940.09.03
申请号	US19380198484	申请日期	1938.03.28
申请人	PENICK ARTHUR J;PENICK KIRBY T	发明人	PENICK ARTHUR J.;PENICK KIRBY T.
分类号	E21B33/06;E21B33/08	主分类号	E21B33/06
代理机构		代理人
主权项
地址

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