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发明名称
摘要
申请公布号
BG18143(A1)
申请公布日期
1974.09.02
申请号
BG19720019757
申请日期
1972.02.18
申请人
发明人
分类号
H01F29/04;H01H21/20;(IPC1-7):H01H21/20
主分类号
H01F29/04
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代理人
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