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摘要
申请公布号
JPS56121785(U)
申请公布日期
1981.09.17
申请号
JP19800018563U
申请日期
1980.02.15
申请人
发明人
分类号
E02D15/06;E21B7/124;E21B7/136;(IPC1-7):E21B7/136
主分类号
E02D15/06
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