CORE CLOGGING PREVENTING DEVICE,申请号JP19810085162-传众专利搜索

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发明名称	CORE CLOGGING PREVENTING DEVICE
摘要
申请公布号	JPS57201491(A)	申请公布日期	1982.12.09
申请号	JP19810085162	申请日期	1981.06.02
申请人	NAGATA KIYOSHI	发明人	NAGATA KIYOSHI
分类号	E21B25/06;E21B25/00	主分类号	E21B25/06
代理机构		代理人
主权项
地址

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