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发明名称
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申请公布号
JPS52160224(U)
申请公布日期
1977.12.05
申请号
JP19760068988U
申请日期
1976.05.31
申请人
发明人
分类号
E21D9/06;E21D11/00;(IPC1-7):E21D9/06
主分类号
E21D9/06
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