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发明名称
Signaling system
摘要
申请公布号
US2425801(A)
申请公布日期
1947.08.19
申请号
US19440545864
申请日期
1944.07.20
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
HANLEY FRANK HAROLD
分类号
H04L19/00;H04M1/57
主分类号
H04L19/00
代理机构
代理人
主权项
地址
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