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发明名称
摘要
申请公布号
JPS5257526(Y2)
申请公布日期
1977.12.27
申请号
JP19720117377U
申请日期
1972.10.12
申请人
发明人
分类号
E01B13/00;E01B3/00;(IPC1-7):E01B13/00
主分类号
E01B13/00
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