,申请号JP19910060818U-传众专利搜索

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发明名称
摘要
申请公布号	JPH0514294(U)	申请公布日期	1993.02.23
申请号	JP19910060818U	申请日期	1991.08.01
申请人		发明人
分类号	E21B10/02;E21B1/00;E21B10/48;(IPC1-7):E21B10/02;E21C3/00	主分类号	E21B10/02
代理机构		代理人
主权项
地址

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