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发明名称
Cathode-ray type sound recording system
摘要
申请公布号
US2478681(A)
申请公布日期
1949.08.09
申请号
US19450605800
申请日期
1945.07.18
申请人
RADIO CORPORATION OF AMERICA
发明人
BEERS GEORGE L.
分类号
G11B11/03
主分类号
G11B11/03
代理机构
代理人
主权项
地址
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