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发明名称
Noiseless sound system
摘要
申请公布号
US2347084(A)
申请公布日期
1944.04.18
申请号
US19420458393
申请日期
1942.09.15
申请人
RADIO CORPORATION
发明人
COONEY JOHN R.
分类号
G11B7/003
主分类号
G11B7/003
代理机构
代理人
主权项
地址
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