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发明名称
Perfectionnements aux systèmes téléphoniques
摘要
申请公布号
FR856153(A)
申请公布日期
1940.06.03
申请号
FRD856153
申请日期
1939.06.13
申请人
ASSOCIATED ELECTRIC LABORATORIES INC.
发明人
分类号
H04M15/04;H04Q3/00;H04Q3/42
主分类号
H04M15/04
代理机构
代理人
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地址
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