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发明名称
Signaling system
摘要
申请公布号
US2148560(A)
申请公布日期
1939.02.28
申请号
US19370134004
申请日期
1937.03.31
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
JOHNSTON DONALD F.;SHIEL JOHN B.
分类号
H04Q1/442
主分类号
H04Q1/442
代理机构
代理人
主权项
地址
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