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发明名称
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申请公布号
JPS54160834(U)
申请公布日期
1979.11.10
申请号
JP19780058765U
申请日期
1978.04.28
申请人
发明人
分类号
E21D9/12;E21D9/08;(IPC1-7):E21D9/08
主分类号
E21D9/12
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