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经营范围
发明名称
Perfectionnements aux systèmes téléphoniques
摘要
申请公布号
FR937959(A)
申请公布日期
1948.09.01
申请号
FRD937959
申请日期
1946.09.10
申请人
AUTOMATIC ELECTRIC LABORATORIES INC.
发明人
分类号
H04Q3/58
主分类号
H04Q3/58
代理机构
代理人
主权项
地址
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