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经营范围
发明名称
Perfectionnements aux haut-parleurs
摘要
申请公布号
FR35519(E)
申请公布日期
1930.03.22
申请号
FRD35519
申请日期
1928.05.09
申请人
COMPAGNIE FRANCAISE POUR L'EXPLOITATION DES PROCEDES THOMSON-HOUSTON
发明人
分类号
E21F15/06;H04R7/20;H04R11/00
主分类号
E21F15/06
代理机构
代理人
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