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经营范围
发明名称
Improvements in or relating to sound motion picture apparatus
摘要
申请公布号
GB527516(A)
申请公布日期
1940.10.10
申请号
GB19390011234
申请日期
1939.04.13
申请人
RADIO CORPORATION OF AMERICA
发明人
分类号
H03G3/00
主分类号
H03G3/00
代理机构
代理人
主权项
地址
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