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经营范围
发明名称
Sound recording
摘要
申请公布号
US2050011(A)
申请公布日期
1936.08.04
申请号
US19320616285
申请日期
1932.06.09
申请人
RADIO CORPORATION
发明人
MCCREARY HAROLD J.
分类号
G11B7/28
主分类号
G11B7/28
代理机构
代理人
主权项
地址
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