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发明名称
摘要
申请公布号
DD124067(A1)
申请公布日期
1977.02.02
申请号
DD19760191707
申请日期
1976.03.05
申请人
发明人
分类号
F16L51/00;(IPC1-7):F16L51/00
主分类号
F16L51/00
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