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经营范围
发明名称
Teletypewriter exchange system
摘要
申请公布号
US2473346(A)
申请公布日期
1949.06.14
申请号
US19440566078
申请日期
1944.12.01
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
RICHARDS KENNETH W.
分类号
H04L12/04;H04L25/04
主分类号
H04L12/04
代理机构
代理人
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