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经营范围
发明名称
Procédé et appareil pour l'enregistrement du son sur un film
摘要
申请公布号
FR827620(A)
申请公布日期
1938.04.29
申请号
FRD827620
申请日期
1937.10.08
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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