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发明名称
摘要
申请公布号
NL7202801(A)
申请公布日期
1972.09.07
申请号
NL19720002801
申请日期
1972.03.02
申请人
发明人
分类号
E03B3/02;F16K31/18;(IPC1-7):E03B3/02
主分类号
E03B3/02
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