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经营范围
发明名称
Sound film reproducing system
摘要
申请公布号
US2252282(A)
申请公布日期
1941.08.12
申请号
US19400330813
申请日期
1940.04.22
申请人
RADIO CORPORATION
发明人
BLANEY ARTHUR C.
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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