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发明名称
Sound recording apparatus
摘要
申请公布号
US2301268(A)
申请公布日期
1942.11.10
申请号
US19410408866
申请日期
1941.08.29
申请人
RADIO CORPORATION
发明人
GEHMAN JOHN B.
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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