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发明名称
Reading aid for the blind
摘要
申请公布号
US2457456(A)
申请公布日期
1948.12.28
申请号
US19460669542
申请日期
1946.05.14
申请人
RADIO CORPORATION OF AMERICA
发明人
FLORY LESLIE E.
分类号
G09B21/00
主分类号
G09B21/00
代理机构
代理人
主权项
地址
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