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发明名称
Plural track sound reproduction
摘要
申请公布号
US2499618(A)
申请公布日期
1950.03.07
申请号
US19460652921
申请日期
1946.03.08
申请人
RADIO CORPORATION OF AMERICA
发明人
WOLFE WALLACE V.
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
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