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发明名称
Improvements in telephonic systems
摘要
申请公布号
GB664241(A)
申请公布日期
1952.01.02
申请号
GB19460029970
申请日期
1946.10.08
申请人
COMPAGNIE GENERALE D'ELECTRICITE
发明人
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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