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发明名称
Calling signal retransmission device for two-wire telephone line
摘要
申请公布号
GB668460(A)
申请公布日期
1952.03.19
申请号
GB19510005001
申请日期
1948.04.15
申请人
COMPAGNIE INDUSTRIELLE DES TELEPHONES
发明人
分类号
H04Q1/442
主分类号
H04Q1/442
代理机构
代理人
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