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发明名称
Procédé et dispositif de sélection de fréquences sonores
摘要
申请公布号
FR927517(A)
申请公布日期
1947.10.31
申请号
FRD927517
申请日期
1946.05.31
申请人
发明人
THOMAS SERGE-JEAN-HENRI
分类号
H01F19/02
主分类号
H01F19/02
代理机构
代理人
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地址
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