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发明名称
Perfectionnements aux systèmes téléphoniques
摘要
申请公布号
FR836908(A)
申请公布日期
1939.01.30
申请号
FRD836908
申请日期
1938.04.20
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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