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发明名称
System for establishing connection within a main exchange with one of a plurality of private branch exchanges
摘要
申请公布号
US2490036(A)
申请公布日期
1949.12.06
申请号
US19450620836
申请日期
1945.10.06
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
DEAKIN GERALD
分类号
H04Q1/18
主分类号
H04Q1/18
代理机构
代理人
主权项
地址
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