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发明名称
Signaling system
摘要
申请公布号
US2375053(A)
申请公布日期
1945.05.01
申请号
US19430499185
申请日期
1943.08.19
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
VAUGHAN HENRY E.
分类号
H04Q1/446
主分类号
H04Q1/446
代理机构
代理人
主权项
地址
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