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摘要
申请公布号
JPS4414644(Y1)
申请公布日期
1969.06.23
申请号
JP19680065481U
申请日期
1968.08.01
申请人
发明人
分类号
E21D23/00;(IPC1-7):E21D23/00
主分类号
E21D23/00
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