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发明名称
摘要
申请公布号
JPS50154632(U)
申请公布日期
1975.12.22
申请号
JP19740064996U
申请日期
1974.06.06
申请人
发明人
分类号
E21D9/087;E21D9/08;(IPC1-7):E21D9/08
主分类号
E21D9/087
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代理人
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