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发明名称
摘要
申请公布号
JPS6215356(Y2)
申请公布日期
1987.04.18
申请号
JP19830189655U
申请日期
1983.12.07
申请人
发明人
分类号
E21B7/124;E21B7/132;(IPC1-7):E21B7/132
主分类号
E21B7/124
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