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发明名称
摘要
申请公布号	JPH0139836(Y2)	申请公布日期	1989.11.29
申请号	JP19820039560U	申请日期	1982.03.19
申请人		发明人
分类号	E21B3/00;E21B7/02;E21B15/00;E21B19/08;E21D20/00;E21D21/00;(IPC1-7):E21C11/02	主分类号	E21B3/00
代理机构		代理人
主权项
地址

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