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发明名称
Signaling system
摘要
申请公布号
US2180334(A)
申请公布日期
1939.11.21
申请号
US19380185852
申请日期
1938.01.20
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BREDEHOFT HAROLD A.
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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