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发明名称
摘要
申请公布号	JPS5849278(Y2)	申请公布日期	1983.11.10
申请号	JP19790099872U	申请日期	1979.07.18
申请人		发明人
分类号	E21B7/02;E21B15/00;E21B19/08;E21C35/04;(IPC1-7):E21C35/04;E21C11/00	主分类号	E21B7/02
代理机构		代理人
主权项
地址

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