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发明名称
Phonograph
摘要
申请公布号
US2247651(A)
申请公布日期
1941.07.01
申请号
US19390276685
申请日期
1939.05.31
申请人
RADIO CORPORATION
发明人
CARSON BENJAMIN R.
分类号
G11B33/02
主分类号
G11B33/02
代理机构
代理人
主权项
地址
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