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发明名称
摘要
申请公布号
JPS5810989(U)
申请公布日期
1983.01.24
申请号
JP19810103828U
申请日期
1981.07.15
申请人
发明人
分类号
E21B19/08;E21B19/084;(IPC1-7):E21C5/06
主分类号
E21B19/08
代理机构
代理人
主权项
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