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发明名称
Sound recording process and apparatus
摘要
申请公布号
US1825441(A)
申请公布日期
1931.09.29
申请号
US19210435984
申请日期
1921.01.08
申请人
RADIO CORPORATION OF AMERICA
发明人
CAWLEY ALOYSIUS J.
分类号
G03B31/00;G11B3/00;G11B7/00
主分类号
G03B31/00
代理机构
代理人
主权项
地址
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