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发明名称
Phonograph record
摘要
申请公布号
US2217170(A)
申请公布日期
1940.10.08
申请号
US19370166645
申请日期
1937.09.30
申请人
RADIO CORPORATION OF AMERICA
发明人
HUNTER JAMES H.
分类号
G11B3/70
主分类号
G11B3/70
代理机构
代理人
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地址
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