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发明名称
Sound reproduction
摘要
申请公布号
US2115001(A)
申请公布日期
1938.04.26
申请号
US19350047288
申请日期
1935.10.29
申请人
UNITED RESEARCH CORPORATION
发明人
BALSLEY JAMES 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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