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发明名称	OPPHENG.
摘要
申请公布号	NO900159(A)	申请公布日期	1990.07.19
申请号	NO19900000159	申请日期	1990.01.12
申请人	NAT OILWELL UK LTD	发明人	JOHNSON, CHARLES STERLING;HART, ROBERT
分类号	E21B33/043;(IPC1-7):E21B33/043	主分类号	E21B33/043
代理机构		代理人
主权项
地址

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