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发明名称
摘要
申请公布号	JPS58176189(U)	申请公布日期	1983.11.25
申请号	JP19820072896U	申请日期	1982.05.17
申请人		发明人
分类号	E21B10/52;E21B10/36;E21B10/38;(IPC1-7):E21B10/38	主分类号	E21B10/52
代理机构		代理人
主权项
地址

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