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发明名称
摘要
申请公布号
JPH0676493(U)
申请公布日期
1994.10.28
申请号
JP19930023479U
申请日期
1993.04.08
申请人
发明人
分类号
E21D9/06;F16L21/00;(IPC1-7):E21D9/06
主分类号
E21D9/06
代理机构
代理人
主权项
地址
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