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发明名称
Perfectionnements aux reproducteurs électro-magnétiques de phonographes et d'instruments de musique
摘要
申请公布号
FR681963(A)
申请公布日期
1930.05.21
申请号
FRD681963
申请日期
1929.01.14
申请人
发明人
BOUTINON GASTON
分类号
H04R11/12
主分类号
H04R11/12
代理机构
代理人
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