BY-PASS VALVE IN WELL,申请号AU19800060924-传众专利搜索

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发明名称	BY-PASS VALVE IN WELL
摘要
申请公布号	AU538359(B2)	申请公布日期	1984.08.09
申请号	AU19800060924	申请日期	1980.07.30
申请人	OTIS ENGINEERING CORP.	发明人	JOHN VICTOR FREDD
分类号	E21B33/12;E21B34/10;E21B49/08;(IPC1-7):E21B34/08;E21B47/06;F16K31/12	主分类号	E21B33/12
代理机构		代理人
主权项
地址

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