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发明名称
An improved signalling-current amplifying arrangement for two-wire telephone lines
摘要
申请公布号
GB668370(A)
申请公布日期
1952.03.19
申请号
GB19480019641
申请日期
1948.07.22
申请人
COMPAGNIE INDUSTRIELLE DES TELEPHONES
发明人
分类号
H04B3/42
主分类号
H04B3/42
代理机构
代理人
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