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发明名称
摘要
申请公布号	JP2573780(Y2)	申请公布日期	1998.06.04
申请号	JP19920041311U	申请日期	1992.06.16
申请人		发明人
分类号	E21B44/00;E21B1/00;E21B1/36;E21B1/38;E21B44/08;(IPC1-7):E21C3/02;E21C3/04	主分类号	E21B44/00
代理机构		代理人
主权项
地址

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