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发明名称
摘要
申请公布号
JPH03128794(U)
申请公布日期
1991.12.25
申请号
JP19900037301U
申请日期
1990.04.09
申请人
发明人
分类号
E21D9/06;E21D9/12;(IPC1-7):E21D9/12
主分类号
E21D9/06
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代理人
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