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发明名称
摘要
申请公布号
JPS5267749(U)
申请公布日期
1977.05.19
申请号
JP19750155722U
申请日期
1975.11.14
申请人
发明人
分类号
E02B7/20;E02B9/06;F16L23/02;F16L23/036;(IPC1-7):E02B9/06
主分类号
E02B7/20
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