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发明名称
Perfectionnements apportés aux appareils électroacoustiques, notamment aux casquesd'écoute
摘要
申请公布号
FR1129211(A)
申请公布日期
1957.01.17
申请号
FRD1129211
申请日期
1955.07.23
申请人
ASSOCIATION DES OUVRIERS EN INSTRUMENTS DE PRECISION
发明人
分类号
H04M1/05
主分类号
H04M1/05
代理机构
代理人
主权项
地址
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