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经营范围
发明名称
Augmentation du rendement des transmissions télégraphiques et de signalisation
摘要
申请公布号
FR857564(A)
申请公布日期
1940.09.19
申请号
FRD857564
申请日期
1939.04.03
申请人
发明人
FREY GASTON
分类号
H04J9/00
主分类号
H04J9/00
代理机构
代理人
主权项
地址
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