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发明名称
Perfectionnements aux systèmes téléphoniques
摘要
申请公布号
FR831620(A)
申请公布日期
1938.09.09
申请号
FRD831620
申请日期
1938.01.04
申请人
ASSOCIATED ELECTRIC LABORATORIES INC.
发明人
分类号
H04M15/10;H04Q1/36
主分类号
H04M15/10
代理机构
代理人
主权项
地址
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