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发明名称
Dispositif destiné à être connecté à des appareils d'installations téléphoniques pour produire un effet acoustique amplifié
摘要
申请公布号
FR759288(A)
申请公布日期
1934.01.31
申请号
FRD759288
申请日期
1933.08.04
申请人
发明人
BOHNENBLUST ALFRED
分类号
H04M1/60
主分类号
H04M1/60
代理机构
代理人
主权项
地址
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