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发明名称
Subscriber signaling system
摘要
申请公布号
US2573349(A)
申请公布日期
1951.10.30
申请号
US19490132174
申请日期
1949.12.09
申请人
ZENITH RADIO CORPORATION
发明人
MILLER BERTRAND J.;MORRIS GEORGE V.
分类号
H04N7/16
主分类号
H04N7/16
代理机构
代理人
主权项
地址
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