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发明名称
Perfectionnements aux systèmes de téléphonie automatique et semiautomatique
摘要
申请公布号
FR928683(A)
申请公布日期
1947.12.04
申请号
FRD928683
申请日期
1946.03.01
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
DEAKIN GERALD
分类号
H04Q1/18
主分类号
H04Q1/18
代理机构
代理人
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