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发明名称
Telegraphic intercommunicating system
摘要
申请公布号
US1920453(A)
申请公布日期
1933.08.01
申请号
US19320586451
申请日期
1932.01.13
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
WATSON EDWARD F.
分类号
H04L12/12
主分类号
H04L12/12
代理机构
代理人
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