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发明名称
摘要
申请公布号	JP2602252(Y2)	申请公布日期	2000.01.11
申请号	JP19910031858U	申请日期	1991.04.09
申请人		发明人
分类号	E21B17/046;E21B17/07;F16B7/10;(IPC1-7):E21B17/00	主分类号	E21B17/046
代理机构		代理人
主权项
地址

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