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发明名称
Phonographic apparatus
摘要
申请公布号
US2254839(A)
申请公布日期
1941.09.02
申请号
US19390253920
申请日期
1939.01.31
申请人
RADIO CORPORATION OF AMERICA
发明人
CONRAD EDWARD C.
分类号
G11B3/20;G11B3/36
主分类号
G11B3/20
代理机构
代理人
主权项
地址
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