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摘要
申请公布号
NL71753(C)
申请公布日期
1953.02.16
申请号
NL19490149626
申请日期
1949.10.28
申请人
发明人
分类号
C07J5/00;C07J75/00;H01F27/04;H01F27/40;H01H3/54;H01H31/10;H01H31/30
主分类号
C07J5/00
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代理人
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