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发明名称
Perfectionnements aux appareils téléphoniques et aux systèmes de signalisation
摘要
申请公布号
FR793085(A)
申请公布日期
1936.01.15
申请号
FRD793085
申请日期
1935.07.09
申请人
发明人
COHEN BERTRAM, SYDNEY;GREGORY HARRY, JOHN
分类号
H04M17/02
主分类号
H04M17/02
代理机构
代理人
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