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发明名称
Sound recording
摘要
申请公布号
US1921037(A)
申请公布日期
1933.08.08
申请号
US19300485648
申请日期
1930.10.01
申请人
ELECTRICAL RESEARCH PRODUCTS, INC.
发明人
MORGAN KENNETH F.
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
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