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发明名称
摘要
申请公布号
BE677122(A)
申请公布日期
1966.07.18
申请号
BED677122
申请日期
1966.02.28
申请人
发明人
分类号
E01C11/08;F16J15/46;F16L25/00;F16L51/00
主分类号
E01C11/08
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