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发明名称
Telecommunication exchange
摘要
申请公布号
GB647773(A)
申请公布日期
1950.12.20
申请号
GB19470006462
申请日期
1947.03.07
申请人
FEDERAL TELECOMMUNICATION LABORATORIES INCORPORATED
发明人
分类号
H04Q3/52;H04Q11/04
主分类号
H04Q3/52
代理机构
代理人
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