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发明名称
摘要
申请公布号
JPS624622(Y2)
申请公布日期
1987.02.02
申请号
JP19810168196U
申请日期
1981.11.13
申请人
发明人
分类号
E21D9/06;E21D9/08;(IPC1-7):E21D9/06
主分类号
E21D9/06
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代理人
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