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经营范围
发明名称
Tonfilm in Sprossenschrift
摘要
申请公布号
DE755802(C)
申请公布日期
1953.03.02
申请号
DE1930R110129D
申请日期
1930.12.13
申请人
RADIO CORPORATION OF AMERICA
发明人
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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