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发明名称
Sound recording
摘要
申请公布号
US2261387(A)
申请公布日期
1941.11.04
申请号
US19400312080
申请日期
1940.01.02
申请人
RADIO CORPORATION OF AMERICA
发明人
KELLOGG EDWARD W.
分类号
H03G3/00
主分类号
H03G3/00
代理机构
代理人
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