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发明名称
摘要
申请公布号
JPS5416341(B2)
申请公布日期
1979.06.21
申请号
JP19740092995
申请日期
1974.08.14
申请人
发明人
分类号
E21D21/00;E21D20/00
主分类号
E21D21/00
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