DOUBLE CORE BARREL,申请号PL19850255794-传众专利搜索

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发明名称	DOUBLE CORE BARREL
摘要
申请公布号	PL149796(B1)	申请公布日期	1990.03.31
申请号	PL19850255794	申请日期	1985.10.15
申请人		发明人
分类号	E21B;E21B25/00;(IPC1-7):E21B25/00	主分类号	E21B
代理机构		代理人
主权项
地址

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