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发明名称
摘要
申请公布号
JPS502656(Y2)
申请公布日期
1975.01.24
申请号
JP19710027739U
申请日期
1971.04.12
申请人
发明人
分类号
E21D9/06;E21D9/08;E21D9/12;(IPC1-7):E21D9/12;E02D17/146;F16L1/02
主分类号
E21D9/06
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代理人
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