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摘要
申请公布号
JPS56171897(U)
申请公布日期
1981.12.18
申请号
JP19800070630U
申请日期
1980.05.22
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发明人
分类号
E21D9/12;(IPC1-7):E21D9/12
主分类号
E21D9/12
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