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申请公布号
BE472799(A)
申请公布日期
1947.10.29
申请号
BED472799
申请日期
1947.04.25
申请人
发明人
分类号
H03C1/22;H03F1/16;H03F3/52;H03F3/54
主分类号
H03C1/22
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