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发明名称
Perfectionnements aux haut-parleurs électro-dynamiques
摘要
申请公布号
FR703878(A)
申请公布日期
1931.05.07
申请号
FRD703878
申请日期
1930.01.03
申请人
SOCIETE DES ETABLISSEMENTS GAUMONT
发明人
分类号
H04R9/04
主分类号
H04R9/04
代理机构
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