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发明名称
Telephone routing system
摘要
申请公布号
US2421919(A)
申请公布日期
1947.06.10
申请号
US19440533314
申请日期
1944.04.29
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
AVERY ROBERT CAMPBELL
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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