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发明名称
摘要
申请公布号
JPS54920(U)
申请公布日期
1979.01.06
申请号
JP19770073402U
申请日期
1977.06.06
申请人
发明人
分类号
E21D9/06;E21D11/00;E21D11/10;(IPC1-7):E21D11/10
主分类号
E21D9/06
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代理人
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