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发明名称
Sound recording system
摘要
申请公布号
US1991178(A)
申请公布日期
1935.02.12
申请号
US19330663274
申请日期
1933.03.29
申请人
ELECTRICAL RESEARCH PRODUCTS, INC.
发明人
SCOVILLE RAY R.
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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