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发明名称
Invisible sound record editor
摘要
申请公布号
US2528699(A)
申请公布日期
1950.11.07
申请号
US19480009300
申请日期
1948.02.18
申请人
RADIO CORPORATION OF AMERICA
发明人
MASTERSON EARL E.
分类号
G11B5/74
主分类号
G11B5/74
代理机构
代理人
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