INJECTION PREVENTING APPARATUS IN CRUDCE OIL DRILL PIT,申请号JP19860030382-传众专利搜索

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发明名称	INJECTION PREVENTING APPARATUS IN CRUDCE OIL DRILL PIT
摘要
申请公布号	JPS62189295(A)	申请公布日期	1987.08.19
申请号	JP19860030382	申请日期	1986.02.14
申请人	HITACHI ZOSEN CORP	发明人	SEKIKAWA HIROSHI
分类号	E21B33/06	主分类号	E21B33/06
代理机构		代理人
主权项
地址

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