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发明名称
摘要
申请公布号
JPS54108534(U)
申请公布日期
1979.07.31
申请号
JP19780004898U
申请日期
1978.01.18
申请人
发明人
分类号
E21D20/00;E21D21/00;(IPC1-7):E21D21/00
主分类号
E21D20/00
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代理人
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