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摘要
申请公布号
JPH0581394(U)
申请公布日期
1993.11.05
申请号
JP19920021140U
申请日期
1992.04.07
申请人
发明人
分类号
E21B1/26;E21B1/00;E21B19/08;(IPC1-7):E21C3/20;E21C5/00
主分类号
E21B1/26
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