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发明名称
Sound reproducing device
摘要
申请公布号
US1848139(A)
申请公布日期
1932.03.08
申请号
US19280266221
申请日期
1928.03.31
申请人
UNITED RESEARCH CORPORATION
发明人
NYSTROM MARTIN
分类号
H04R7/04
主分类号
H04R7/04
代理机构
代理人
主权项
地址
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