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经营范围
发明名称
Perfectionnement aux amplificateurs téléphoniques
摘要
申请公布号
FR1079888(A)
申请公布日期
1954.12.03
申请号
FRD1079888
申请日期
1953.03.25
申请人
发明人
BAROK ALBERT
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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