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发明名称
Radio audience counting system
摘要
申请公布号
US2636671(A)
申请公布日期
1953.04.28
申请号
US19490122637
申请日期
1949.10.21
申请人
RADIO CORPORATION
发明人
SHELBY ROBERT EVART
分类号
H04H60/43
主分类号
H04H60/43
代理机构
代理人
主权项
地址
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